31=3r-(-3r-7)

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Solution for 31=3r-(-3r-7) equation: 



31=3r-(-3r-7)

We move all terms to the left:

31-(3r-(-3r-7))=0



We calculate terms in parentheses: -(3r-(-3r-7)), so:

3r-(-3r-7)

We get rid of parentheses

3r+3r+7

We add all the numbers together, and all the variables

6r+7

Back to the equation:

-(6r+7)



We get rid of parentheses

-6r-7+31=0

We add all the numbers together, and all the variables

-6r+24=0

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

-6r=-24

r=-24/-6

r=+4

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