12=a-15

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Solution for 12=a-15 equation:


Simplifying
12 = a + -15

Reorder the terms:
12 = -15 + a

Solving
12 = -15 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
12 + -1a = -15 + a + -1a

Combine like terms: a + -1a = 0
12 + -1a = -15 + 0
12 + -1a = -15

Add '-12' to each side of the equation.
12 + -12 + -1a = -15 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = -15 + -12
-1a = -15 + -12

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

Divide each side by '-1'.
a = 27

Simplifying
a = 27

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