3a+12=-9

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Solution for 3a+12=-9 equation: 


Simplifying
3a + 12 = -9

Reorder the terms:
12 + 3a = -9

Solving
12 + 3a = -9

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + 3a = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 3a = -9 + -12
3a = -9 + -12

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

Divide each side by '3'.
a = -7

Simplifying
a = -7

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