5(a-4)=85

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Solution for 5(a-4)=85 equation: 


Simplifying
5(a + -4) = 85

Reorder the terms:
5(-4 + a) = 85
(-4 * 5 + a * 5) = 85
(-20 + 5a) = 85

Solving
-20 + 5a = 85

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 + 5a = 85 + 20

Combine like terms: -20 + 20 = 0
0 + 5a = 85 + 20
5a = 85 + 20

Combine like terms: 85 + 20 = 105
5a = 105

Divide each side by '5'.
a = 21

Simplifying
a = 21

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