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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