6a+15-12a=-21

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Solution for 6a+15-12a=-21 equation:


Simplifying
6a + 15 + -12a = -21

Reorder the terms:
15 + 6a + -12a = -21

Combine like terms: 6a + -12a = -6a
15 + -6a = -21

Solving
15 + -6a = -21

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 + -6a = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -6a = -21 + -15
-6a = -21 + -15

Combine like terms: -21 + -15 = -36
-6a = -36

Divide each side by '-6'.
a = 6

Simplifying
a = 6

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