39=15-3r

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Solution for 39=15-3r equation: 



39=15-3r

We move all terms to the left:

39-(15-3r)=0

We add all the numbers together, and all the variables

-(-3r+15)+39=0

We get rid of parentheses

3r-15+39=0

We add all the numbers together, and all the variables

3r+24=0

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

3r=-24

r=-24/3

r=-8

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