-40=-120+r

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Solution for -40=-120+r equation: 



-40=-120+r

We move all terms to the left:

-40-(-120+r)=0

We add all the numbers together, and all the variables

-(r-120)-40=0

We get rid of parentheses

-r+120-40=0

We add all the numbers together, and all the variables

-1r+80=0

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

-r=-80

r=-80/-1

r=+80

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