15=18+r/3

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Solution for 15=18+r/3 equation: 



15=18+r/3

We move all terms to the left:

15-(18+r/3)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-r/3-18+15=0

We multiply all the terms by the denominator


-r-18*3+15*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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