100=90+x

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Solution for 100=90+x equation: 



100=90+x

We move all terms to the left:

100-(90+x)=0

We add all the numbers together, and all the variables

-(x+90)+100=0

We get rid of parentheses

-x-90+100=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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