-21=9a-15+3a

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Solution for -21=9a-15+3a equation:


Simplifying
-21 = 9a + -15 + 3a

Reorder the terms:
-21 = -15 + 9a + 3a

Combine like terms: 9a + 3a = 12a
-21 = -15 + 12a

Solving
-21 = -15 + 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.
-21 + -12a = -15 + 12a + -12a

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

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

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

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

Divide each side by '-12'.
a = -0.5

Simplifying
a = -0.5

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