15=3a-12

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Solution for 15=3a-12 equation:


Simplifying
15 = 3a + -12

Reorder the terms:
15 = -12 + 3a

Solving
15 = -12 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
15 + -3a = -12 + 3a + -3a

Combine like terms: 3a + -3a = 0
15 + -3a = -12 + 0
15 + -3a = -12

Add '-15' to each side of the equation.
15 + -15 + -3a = -12 + -15

Combine like terms: 15 + -15 = 0
0 + -3a = -12 + -15
-3a = -12 + -15

Combine like terms: -12 + -15 = -27
-3a = -27

Divide each side by '-3'.
a = 9

Simplifying
a = 9

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