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5(3r+3)=75
We move all terms to the left:
5(3r+3)-(75)=0
We multiply parentheses
15r+15-75=0
We add all the numbers together, and all the variables
15r-60=0
We move all terms containing r to the left, all other terms to the right
15r=60
r=60/15
r=4
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