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15=-r/8
We move all terms to the left:
15-(-r/8)=0
We get rid of parentheses
r/8+15=0
We multiply all the terms by the denominator
r+15*8=0
We add all the numbers together, and all the variables
r+120=0
We move all terms containing r to the left, all other terms to the right
r=-120
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