-90=13(20+x)

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Solution for -90=13(20+x) equation: 



-90=13(20+x)

We move all terms to the left:

-90-(13(20+x))=0

We add all the numbers together, and all the variables

-(13(x+20))-90=0



We calculate terms in parentheses: -(13(x+20)), so:

13(x+20)

We multiply parentheses

13x+260

Back to the equation:

-(13x+260)



We get rid of parentheses

-13x-260-90=0

We add all the numbers together, and all the variables

-13x-350=0

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

-13x=350

x=350/-13

x=-26+12/13

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