27-a=12

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Solution for 27-a=12 equation: 


Simplifying
27 + -1a = 12

Solving
27 + -1a = 12

Solving for variable 'a'.

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

Add '-27' to each side of the equation.
27 + -27 + -1a = 12 + -27

Combine like terms: 27 + -27 = 0
0 + -1a = 12 + -27
-1a = 12 + -27

Combine like terms: 12 + -27 = -15
-1a = -15

Divide each side by '-1'.
a = 15

Simplifying
a = 15

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