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2r-(7r-8)=r+5
We move all terms to the left:
2r-(7r-8)-(r+5)=0
We get rid of parentheses
2r-7r-r+8-5=0
We add all the numbers together, and all the variables
-6r+3=0
We move all terms containing r to the left, all other terms to the right
-6r=-3
r=-3/-6
r=1/2
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