4(a-1)=80

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Solution for 4(a-1)=80 equation: 


Simplifying
4(a + -1) = 80

Reorder the terms:
4(-1 + a) = 80
(-1 * 4 + a * 4) = 80
(-4 + 4a) = 80

Solving
-4 + 4a = 80

Solving for variable 'a'.

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

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

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

Combine like terms: 80 + 4 = 84
4a = 84

Divide each side by '4'.
a = 21

Simplifying
a = 21

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