-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

-(100+x)-90=0

We get rid of parentheses

-x-100-90=0

We add all the numbers together, and all the variables

-1x-190=0

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

-x=190

x=190/-1

x=-190

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