5(a-1)=55

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Solution for 5(a-1)=55 equation: 


Simplifying
5(a + -1) = 55

Reorder the terms:
5(-1 + a) = 55
(-1 * 5 + a * 5) = 55
(-5 + 5a) = 55

Solving
-5 + 5a = 55

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 = 55 + 5

Combine like terms: -5 + 5 = 0
0 + 5a = 55 + 5
5a = 55 + 5

Combine like terms: 55 + 5 = 60
5a = 60

Divide each side by '5'.
a = 12

Simplifying
a = 12

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