8=-r+3r

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Solution for 8=-r+3r equation: 



8=-r+3r

We move all terms to the left:

8-(-r+3r)=0

We add all the numbers together, and all the variables

-(+2r)+8=0

We get rid of parentheses

-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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