5(a-3)=90

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Solution for 5(a-3)=90 equation: 


Simplifying
5(a + -3) = 90

Reorder the terms:
5(-3 + a) = 90
(-3 * 5 + a * 5) = 90
(-15 + 5a) = 90

Solving
-15 + 5a = 90

Solving for variable 'a'.

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

Add '15' to each side of the equation.
-15 + 15 + 5a = 90 + 15

Combine like terms: -15 + 15 = 0
0 + 5a = 90 + 15
5a = 90 + 15

Combine like terms: 90 + 15 = 105
5a = 105

Divide each side by '5'.
a = 21

Simplifying
a = 21

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