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 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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