15-a=3

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Solution for 15-a=3 equation:


Simplifying
15 + -1a = 3

Solving
15 + -1a = 3

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + -1a = 3 + -15

Combine like terms: 15 + -15 = 0
0 + -1a = 3 + -15
-1a = 3 + -15

Combine like terms: 3 + -15 = -12
-1a = -12

Divide each side by '-1'.
a = 12

Simplifying
a = 12

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