5-7a=12

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Solution for 5-7a=12 equation: 


Simplifying
5 + -7a = 12

Solving
5 + -7a = 12

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + -7a = 12 + -5

Combine like terms: 5 + -5 = 0
0 + -7a = 12 + -5
-7a = 12 + -5

Combine like terms: 12 + -5 = 7
-7a = 7

Divide each side by '-7'.
a = -1

Simplifying
a = -1

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