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-37=3r-7
We move all terms to the left:
-37-(3r-7)=0
We get rid of parentheses
-3r+7-37=0
We add all the numbers together, and all the variables
-3r-30=0
We move all terms containing r to the left, all other terms to the right
-3r=30
r=30/-3
r=-10
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