R(r+3)+7(r+3)=0

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Solution for R(r+3)+7(r+3)=0 equation: 



(R+3)+7(R+3)=0

We multiply parentheses

(R+3)+7R+21=0

We get rid of parentheses

R+7R+3+21=0

We add all the numbers together, and all the variables

8R+24=0

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

8R=-24

R=-24/8

R=-3

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