8=-2r+5-7r-15

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Solution for 8=-2r+5-7r-15 equation: 



8=-2r+5-7r-15

We move all terms to the left:

8-(-2r+5-7r-15)=0

We add all the numbers together, and all the variables

-(-9r-10)+8=0

We get rid of parentheses

9r+10+8=0

We add all the numbers together, and all the variables

9r+18=0

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

9r=-18

r=-18/9

r=-2

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