18=15+r/3

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Solution for 18=15+r/3 equation: 



18=15+r/3

We move all terms to the left:

18-(15+r/3)=0

We add all the numbers together, and all the variables

-(r/3+15)+18=0

We get rid of parentheses

-r/3-15+18=0

We multiply all the terms by the denominator


-r-15*3+18*3=0

We add all the numbers together, and all the variables

-1r+9=0

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

-r=-9

r=-9/-1

r=+9

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