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15(r+15)-61=734
We move all terms to the left:
15(r+15)-61-(734)=0
We add all the numbers together, and all the variables
15(r+15)-795=0
We multiply parentheses
15r+225-795=0
We add all the numbers together, and all the variables
15r-570=0
We move all terms containing r to the left, all other terms to the right
15r=570
r=570/15
r=38
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