Solving of simultaneous linear equation:
For example:
Definition.:
-t simultaneous linear equation.
homogen simultaneous linear equation
inhomogen simultaneous linear equation
The number of equations is the same as the unknown parameters
A is regular 
the simultaneous linear equation is solvable.
7.1. Cramer – rule
The endorsement of the matrix 
by columns, which is created by column-changing: the 
column was changed to the 
vector.
For example:
=
Checking: 
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