12=ax-3x

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Solution for 12=ax-3x equation: 


Simplifying
12 = ax + -3x

Solving
12 = ax + -3x

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-1ax' to each side of the equation.
12 + -1ax = ax + -1ax + -3x

Combine like terms: ax + -1ax = 0
12 + -1ax = 0 + -3x
12 + -1ax = -3x

Add '-12' to each side of the equation.
12 + -12 + -1ax = -12 + -3x

Combine like terms: 12 + -12 = 0
0 + -1ax = -12 + -3x
-1ax = -12 + -3x

Divide each side by '-1x'.
a = 12x-1 + 3

Simplifying
a = 12x-1 + 3

Reorder the terms:
a = 3 + 12x-1

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