90=(7x+6)+(6x-7)

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Solution for 90=(7x+6)+(6x-7) equation: 



90=(7x+6)+(6x-7)

We move all terms to the left:

90-((7x+6)+(6x-7))=0



We calculate terms in parentheses: -((7x+6)+(6x-7)), so:

(7x+6)+(6x-7)

We get rid of parentheses

7x+6x+6-7

We add all the numbers together, and all the variables

13x-1

Back to the equation:

-(13x-1)



We get rid of parentheses

-13x+1+90=0

We add all the numbers together, and all the variables

-13x+91=0

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

-13x=-91

x=-91/-13

x=+7

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