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-31=-2r+7
We move all terms to the left:
-31-(-2r+7)=0
We get rid of parentheses
2r-7-31=0
We add all the numbers together, and all the variables
2r-38=0
We move all terms containing r to the left, all other terms to the right
2r=38
r=38/2
r=19
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