90=9(7+x)

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Solution for 90=9(7+x) equation: 



90=9(7+x)

We move all terms to the left:

90-(9(7+x))=0

We add all the numbers together, and all the variables

-(9(x+7))+90=0



We calculate terms in parentheses: -(9(x+7)), so:

9(x+7)

We multiply parentheses

9x+63

Back to the equation:

-(9x+63)



We get rid of parentheses

-9x-63+90=0

We add all the numbers together, and all the variables

-9x+27=0

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

-9x=-27

x=-27/-9

x=+3

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