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2r-7=5r+8
We move all terms to the left:
2r-7-(5r+8)=0
We get rid of parentheses
2r-5r-8-7=0
We add all the numbers together, and all the variables
-3r-15=0
We move all terms containing r to the left, all other terms to the right
-3r=15
r=15/-3
r=-5
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