-70=-100+x

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Solution for -70=-100+x equation: 



-70=-100+x

We move all terms to the left:

-70-(-100+x)=0

We add all the numbers together, and all the variables

-(x-100)-70=0

We get rid of parentheses

-x+100-70=0

We add all the numbers together, and all the variables

-1x+30=0

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

-x=-30

x=-30/-1

x=+30

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