r-31=-r-7

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Solution for r-31=-r-7 equation: 



r-31=-r-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

r-(-1r-7)-31=0

We get rid of parentheses

r+1r+7-31=0

We add all the numbers together, and all the variables

2r-24=0

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

2r=24

r=24/2

r=12

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