4-a=12

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Solution for 4-a=12 equation: 


Simplifying
4 + -1a = 12

Solving
4 + -1a = 12

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + -1a = 12 + -4

Combine like terms: 4 + -4 = 0
0 + -1a = 12 + -4
-1a = 12 + -4

Combine like terms: 12 + -4 = 8
-1a = 8

Divide each side by '-1'.
a = -8

Simplifying
a = -8

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