100=-7+r

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Solution for 100=-7+r equation: 



100=-7+r

We move all terms to the left:

100-(-7+r)=0

We add all the numbers together, and all the variables

-(r-7)+100=0

We get rid of parentheses

-r+7+100=0

We add all the numbers together, and all the variables

-1r+107=0

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

-r=-107

r=-107/-1

r=+107

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