-90=3(3a-6)

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



-90=3(3a-6)

We move all terms to the left:

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



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

3(3a-6)

We multiply parentheses

9a-18

Back to the equation:

-(9a-18)



We get rid of parentheses

-9a+18-90=0

We add all the numbers together, and all the variables

-9a-72=0

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

-9a=72

a=72/-9

a=-8

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