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5(r+3)-2(r-4)=53
We move all terms to the left:
5(r+3)-2(r-4)-(53)=0
We multiply parentheses
5r-2r+15+8-53=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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