-18=-7-r

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Solution for -18=-7-r equation: 



-18=-7-r

We move all terms to the left:

-18-(-7-r)=0

We add all the numbers together, and all the variables

-(-1r-7)-18=0

We get rid of parentheses

1r+7-18=0

We add all the numbers together, and all the variables

r-11=0

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

r=11

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