90=9(2a+4)

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Solution for 90=9(2a+4) equation: 



90=9(2a+4)

We move all terms to the left:

90-(9(2a+4))=0



We calculate terms in parentheses: -(9(2a+4)), so:

9(2a+4)

We multiply parentheses

18a+36

Back to the equation:

-(18a+36)



We get rid of parentheses

-18a-36+90=0

We add all the numbers together, and all the variables

-18a+54=0

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

-18a=-54

a=-54/-18

a=+3

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