-9+12a-21a=3

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Solution for -9+12a-21a=3 equation: 


Simplifying
-9 + 12a + -21a = 3

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

Solving
-9 + -9a = 3

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + -9a = 3 + 9

Combine like terms: -9 + 9 = 0
0 + -9a = 3 + 9
-9a = 3 + 9

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

Divide each side by '-9'.
a = -1.333333333

Simplifying
a = -1.333333333

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