18=15+r

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Solution for 18=15+r equation: 



18=15+r

We move all terms to the left:

18-(15+r)=0

We add all the numbers together, and all the variables

-(r+15)+18=0

We get rid of parentheses

-r-15+18=0

We add all the numbers together, and all the variables

-1r+3=0

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

-r=-3

r=-3/-1

r=+3

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