-11=-18+r

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Solution for -11=-18+r equation: 



-11=-18+r

We move all terms to the left:

-11-(-18+r)=0

We add all the numbers together, and all the variables

-(r-18)-11=0

We get rid of parentheses

-r+18-11=0

We add all the numbers together, and all the variables

-1r+7=0

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

-r=-7

r=-7/-1

r=+7

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