-90=-100+n

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Solution for -90=-100+n equation: 



-90=-100+n

We move all terms to the left:

-90-(-100+n)=0

We add all the numbers together, and all the variables

-(n-100)-90=0

We get rid of parentheses

-n+100-90=0

We add all the numbers together, and all the variables

-1n+10=0

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

-n=-10

n=-10/-1

n=+10

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