-r+5r=8-r+7

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



-r+5r=8-r+7

We move all terms to the left:

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

We add all the numbers together, and all the variables

-r+5r-(-1r+15)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4r+1r-15=0

We add all the numbers together, and all the variables

5r-15=0

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

5r=15

r=15/5

r=3

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