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

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Solution for (-4r)-r-(-7r)=-20 equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

2r+20=0

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

2r=-20

r=-20/2

r=-10

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