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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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'); resetdisplay(); for(var i = 0; i <10; i++) { ganswer[i] = prompt(question[i],""); if (ganswer[i] == "quit" || ganswer[i] == "QUIT" || ganswer[i] == "Quit") { break; } q++; if (ganswer[i] == answer[i]) { c++; } else { rightans[i] = 0; w++; } resetdisplay(); } for(var i = 0; i < 10; i++) { if (rightans[i] == 0) { expl = expl + explain[i]; } } parent.frames[0].document.write(expl); parent.frames[0].document.write("
"); } question[0] = 'Solve for x: 2x = 3x -1'; question[1] = 'Solve for x: 4x = 2x -5'; question[2] = 'Solve for x: 3x = x + 4'; question[3] = 'Solve for x: 6x = 2x - 6'; question[4] = 'Solve for x: 12x = 50x -20'; question[5] = 'Solve for x: (x/6) = (x/2) + (5/4)'; question[6] = 'Solve for x: (x/2) = (x/4) + (1/2)'; question[7] = 'Solve for x: (2x/3) + 2 = (x/4)'; question[8] = 'Solve for x: (x/3) + 2 = (2x/3)'; question[9] = 'Solve for x: (100x/3) + (21/30) = (101x/2)'; answer[0] = '1'; answer[1] = '-5/2'; answer[2] = '2'; answer[3] = '-3/2'; answer[4] = '10/19'; answer[5] = '-15/4'; answer[6] = '2'; answer[7] = '-24/5'; answer[8] = '6'; answer[9] = '21/515'; explain[0] = '#1

2x = 3x -1

Subtract 3x from each side.

-x = -1

Divide each side by -1.

x = 1

'; explain[1] = '#2

4x = 2x -5

Subract 2x from each side.

2x = -5

Divide each side by 2.

x = -5/2

'; explain[2] = '#3

3x = x + 4

Subtract x from each side.

2x = 4

Divide each side by 2.

x = 2

'; explain[3] = '#4

6x = 2x - 6

Subract 2x from each side.

4x = -6

Divide each side by 4.

x = -6/4 = -3/2

'; explain[4] = '#5

12x = 50x - 20

Subtract 50x from each side.

-38x = -20

Divide each side by -38.

s = 20/38 = 10/19

'; explain[5] = '#6

(x/6) = (x/2) + (5/4)

Find a common denominator.

(2x/12) = (6x/12) + (15/12)

Multiply both sides by 12.

2x = 6x +15

Subtract 6x from each side.

-4x = 15

Divide each side by -4.

x = -15/4

'; explain[6] = '#7

(x/2) = (x/4) + (1/2)

Find a common denominator.

(2x/4) = (x/4) + (2/4)

Multiply each side by 4.

2x = x + 2

Subtract x from each side.

x = 2

'; explain[7] = '#8

(2x/3) + 2 = (x/4)

Find a common denominator and convert 2 to fraction form.

(8x/12) + (24/12) = (3x/12)

Multiply each side by 12.

8x +24 = 3x

Subtract 8x from each side.

24 = -5x

Divide each side by -5.

-24/5 = x

'; explain[8] = '#9

(x/3) + 2 = (2x/3)

Convert 2 to fraction form.

(x/3) + (6/3) = (2x/3)

Multiply both sides by 3.

x + 6 = 2x

Subtract x from both sides.

6 = x

'; explain[9] = '#10

(100x/3) + (21/30) = (101x/2)

Find a common denominator.

(1000x/30) + (21/30) = (1515x/30)

Multiply both sides by 30.

1000x + 21 = 1515x

Subtract 1000x from both sides.

21 = 515x

Divide both sides by 515.

21/515 = x

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->