80-4a=20

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Solution for 80-4a=20 equation: 


Simplifying
80 + -4a = 20

Solving
80 + -4a = 20

Solving for variable 'a'.

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

Add '-80' to each side of the equation.
80 + -80 + -4a = 20 + -80

Combine like terms: 80 + -80 = 0
0 + -4a = 20 + -80
-4a = 20 + -80

Combine like terms: 20 + -80 = -60
-4a = -60

Divide each side by '-4'.
a = 15

Simplifying
a = 15

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