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8(9r-3)=(-240)
We move all terms to the left:
8(9r-3)-((-240))=0
We add all the numbers together, and all the variables
8(9r-3)+240=0
We multiply parentheses
72r-24+240=0
We add all the numbers together, and all the variables
72r+216=0
We move all terms containing r to the left, all other terms to the right
72r=-216
r=-216/72
r=-3
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