-r+7=-4r-20

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Solution for -r+7=-4r-20 equation: 



-r+7=-4r-20

We move all terms to the left:

-r+7-(-4r-20)=0

We add all the numbers together, and all the variables

-1r-(-4r-20)+7=0

We get rid of parentheses

-1r+4r+20+7=0

We add all the numbers together, and all the variables

3r+27=0

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

3r=-27

r=-27/3

r=-9

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