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5r+5(r+15)=400
We move all terms to the left:
5r+5(r+15)-(400)=0
We multiply parentheses
5r+5r+75-400=0
We add all the numbers together, and all the variables
10r-325=0
We move all terms containing r to the left, all other terms to the right
10r=325
r=325/10
r=32+1/2
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