90=(6x-12)+(3x+30)

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Solution for 90=(6x-12)+(3x+30) equation: 



90=(6x-12)+(3x+30)

We move all terms to the left:

90-((6x-12)+(3x+30))=0



We calculate terms in parentheses: -((6x-12)+(3x+30)), so:

(6x-12)+(3x+30)

We get rid of parentheses

6x+3x-12+30

We add all the numbers together, and all the variables

9x+18

Back to the equation:

-(9x+18)



We get rid of parentheses

-9x-18+90=0

We add all the numbers together, and all the variables

-9x+72=0

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

-9x=-72

x=-72/-9

x=+8

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