-7=r-18

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Solution for -7=r-18 equation: 



-7=r-18

We move all terms to the left:

-7-(r-18)=0

We get rid of parentheses

-r+18-7=0

We add all the numbers together, and all the variables

-1r+11=0

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

-r=-11

r=-11/-1

r=+11

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