-8r+7r=8-7r+4r

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Solution for -8r+7r=8-7r+4r equation: 



-8r+7r=8-7r+4r

We move all terms to the left:

-8r+7r-(8-7r+4r)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1r+3r-8=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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