5(a-1)=90

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Solution for 5(a-1)=90 equation: 


Simplifying
5(a + -1) = 90

Reorder the terms:
5(-1 + a) = 90
(-1 * 5 + a * 5) = 90
(-5 + 5a) = 90

Solving
-5 + 5a = 90

Solving for variable 'a'.

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

Add '5' to each side of the equation.
-5 + 5 + 5a = 90 + 5

Combine like terms: -5 + 5 = 0
0 + 5a = 90 + 5
5a = 90 + 5

Combine like terms: 90 + 5 = 95
5a = 95

Divide each side by '5'.
a = 19

Simplifying
a = 19

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