3-4a=12

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Solution for 3-4a=12 equation: 


Simplifying
3 + -4a = 12

Solving
3 + -4a = 12

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + -4a = 12 + -3

Combine like terms: 3 + -3 = 0
0 + -4a = 12 + -3
-4a = 12 + -3

Combine like terms: 12 + -3 = 9
-4a = 9

Divide each side by '-4'.
a = -2.25

Simplifying
a = -2.25

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