-12a+-9a=3a

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Solution for -12a+-9a=3a equation: 


Simplifying
-12a + -9a = 3a

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

Solving
-21a = 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.
-21a + -3a = 3a + -3a

Combine like terms: -21a + -3a = -24a
-24a = 3a + -3a

Combine like terms: 3a + -3a = 0
-24a = 0

Divide each side by '-24'.
a = 0

Simplifying
a = 0

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