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5(r-72)=99
We move all terms to the left:
5(r-72)-(99)=0
We multiply parentheses
5r-360-99=0
We add all the numbers together, and all the variables
5r-459=0
We move all terms containing r to the left, all other terms to the right
5r=459
r=459/5
r=91+4/5
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