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-3r-6=-7r+34
We move all terms to the left:
-3r-6-(-7r+34)=0
We get rid of parentheses
-3r+7r-34-6=0
We add all the numbers together, and all the variables
4r-40=0
We move all terms containing r to the left, all other terms to the right
4r=40
r=40/4
r=10
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