4a+9=-12

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Solution for 4a+9=-12 equation: 


Simplifying
4a + 9 = -12

Reorder the terms:
9 + 4a = -12

Solving
9 + 4a = -12

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 + 4a = -12 + -9

Combine like terms: 9 + -9 = 0
0 + 4a = -12 + -9
4a = -12 + -9

Combine like terms: -12 + -9 = -21
4a = -21

Divide each side by '4'.
a = -5.25

Simplifying
a = -5.25

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