3(r+7)=-4r

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Solution for 3(r+7)=-4r equation: 



3(r+7)=-4r

We move all terms to the left:

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

We multiply parentheses

3r-(-4r)+21=0

We get rid of parentheses

3r+4r+21=0

We add all the numbers together, and all the variables

7r+21=0

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

7r=-21

r=-21/7

r=-3

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