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-(2r+5)=3r
We move all terms to the left:
-(2r+5)-(3r)=0
We add all the numbers together, and all the variables
-3r-(2r+5)=0
We get rid of parentheses
-3r-2r-5=0
We add all the numbers together, and all the variables
-5r-5=0
We move all terms containing r to the left, all other terms to the right
-5r=5
r=5/-5
r=-1
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