-7=r+8-4r

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



-7=r+8-4r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3r-8-7=0

We add all the numbers together, and all the variables

3r-15=0

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

3r=15

r=15/3

r=5

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