# Re: Simple algebra for a dummy

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Posted by Joel on November 13, 2002 at 09:52:56:

In Reply to: Simple algebra for a dummy posted by Sam on November 13, 2002 at 09:00:05:

: In working with Algebra I am doing expression simplfication
: In doing the following I am getting a little confused

: 6a-3b-2a-6b=4a-9b
: =-5

: 6a(minus)2a I understand because I see the (-) minus sign
: Now how do I know
: 3b is supposed to plus(+) 6b???
: I dont see a plus sign anywhere
: That is ofcourse without figuring lt out from the outcome

-3b-6b = -9b

or, looking at it another way:
-3b = -(3b) = -(+3b)
[here the "+" and "-" signs don't indicate an operation; they just indicate a positive or negative value. I'll indicate OPERATIONS by spelling out PLUS or MINUS]

so,
-3b MINUS 6b = (-3b) PLUS (-6b) = (-(+3b)) PLUS (-(+6b) =
-((+3b) PLUS (+6b)) = -((+9b)) = -9b

Does that help? (I hope I didn't confuse you even more.)

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