20-4a=12

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Solution for 20-4a=12 equation: 


Simplifying
20 + -4a = 12

Solving
20 + -4a = 12

Solving for variable 'a'.

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

Add '-20' to each side of the equation.
20 + -20 + -4a = 12 + -20

Combine like terms: 20 + -20 = 0
0 + -4a = 12 + -20
-4a = 12 + -20

Combine like terms: 12 + -20 = -8
-4a = -8

Divide each side by '-4'.
a = 2

Simplifying
a = 2

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