-3(r+9)=31

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Solution for -3(r+9)=31 equation: 



-3(r+9)=31

We move all terms to the left:

-3(r+9)-(31)=0

We multiply parentheses

-3r-27-31=0

We add all the numbers together, and all the variables

-3r-58=0

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

-3r=58

r=58/-3

r=-19+1/3

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