90=(100+x)

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Solution for 90=(100+x) equation: 



90=(100+x)

We move all terms to the left:

90-((100+x))=0

We add all the numbers together, and all the variables

-((x+100))+90=0



We calculate terms in parentheses: -((x+100)), so:

(x+100)

We get rid of parentheses

x+100

Back to the equation:

-(x+100)



We get rid of parentheses

-x-100+90=0

We add all the numbers together, and all the variables

-1x-10=0

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

-x=10

x=10/-1

x=-10

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