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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