9=4a+12

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Solution for 9=4a+12 equation:


Simplifying
9 = 4a + 12

Reorder the terms:
9 = 12 + 4a

Solving
9 = 12 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
9 + -4a = 12 + 4a + -4a

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

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 = 3
-4a = 3

Divide each side by '-4'.
a = -0.75

Simplifying
a = -0.75

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