15=12a-21

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Solution for 15=12a-21 equation:


Simplifying
15 = 12a + -21

Reorder the terms:
15 = -21 + 12a

Solving
15 = -21 + 12a

Solving for variable 'a'.

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

Add '-12a' to each side of the equation.
15 + -12a = -21 + 12a + -12a

Combine like terms: 12a + -12a = 0
15 + -12a = -21 + 0
15 + -12a = -21

Add '-15' to each side of the equation.
15 + -15 + -12a = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -12a = -21 + -15
-12a = -21 + -15

Combine like terms: -21 + -15 = -36
-12a = -36

Divide each side by '-12'.
a = 3

Simplifying
a = 3

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