-90=3(5a-5)

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



-90=3(5a-5)

We move all terms to the left:

-90-(3(5a-5))=0



We calculate terms in parentheses: -(3(5a-5)), so:

3(5a-5)

We multiply parentheses

15a-15

Back to the equation:

-(15a-15)



We get rid of parentheses

-15a+15-90=0

We add all the numbers together, and all the variables

-15a-75=0

We move all terms containing a to the left, all other terms to the right

-15a=75

a=75/-15

a=-5

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