r-1+8=-15+8+4r-r

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Solution for r-1+8=-15+8+4r-r equation: 



r-1+8=-15+8+4r-r

We move all terms to the left:

r-1+8-(-15+8+4r-r)=0

We add all the numbers together, and all the variables

r-(3r-7)-1+8=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

r-3r+7+7=0

We add all the numbers together, and all the variables

-2r+14=0

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

-2r=-14

r=-14/-2

r=+7

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