90=-5(3a-6)

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Solution for 90=-5(3a-6) equation: 



90=-5(3a-6)

We move all terms to the left:

90-(-5(3a-6))=0



We calculate terms in parentheses: -(-5(3a-6)), so:

-5(3a-6)

We multiply parentheses

-15a+30

Back to the equation:

-(-15a+30)



We get rid of parentheses

15a-30+90=0

We add all the numbers together, and all the variables

15a+60=0

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

15a=-60

a=-60/15

a=-4

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