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-35=-2r-7
We move all terms to the left:
-35-(-2r-7)=0
We get rid of parentheses
2r+7-35=0
We add all the numbers together, and all the variables
2r-28=0
We move all terms containing r to the left, all other terms to the right
2r=28
r=28/2
r=14
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