18=17-r

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Solution for 18=17-r equation: 



18=17-r

We move all terms to the left:

18-(17-r)=0

We add all the numbers together, and all the variables

-(-1r+17)+18=0

We get rid of parentheses

1r-17+18=0

We add all the numbers together, and all the variables

r+1=0

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

r=-1

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