-6(1+3r)=31

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Solution for -6(1+3r)=31 equation: 



-6(1+3r)=31

We move all terms to the left:

-6(1+3r)-(31)=0

We add all the numbers together, and all the variables

-6(3r+1)-31=0

We multiply parentheses

-18r-6-31=0

We add all the numbers together, and all the variables

-18r-37=0

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

-18r=37

r=37/-18

r=-2+1/18

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