r-7=-15+3r

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Solution for r-7=-15+3r equation: 



r-7=-15+3r

We move all terms to the left:

r-7-(-15+3r)=0

We add all the numbers together, and all the variables

r-(3r-15)-7=0

We get rid of parentheses

r-3r+15-7=0

We add all the numbers together, and all the variables

-2r+8=0

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

-2r=-8

r=-8/-2

r=+4

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