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Best Answer
(3r + 18)/12 = (4r - 48)/4
Multiply both sides by 12: (3r + 18) = 3*(4r - 48)
or: 3r + 18 = 12r - 144
Subtract 3r from both sides: 18 = 9r - 144
Add 144 to both sides: 162 = 9r
Divide both sides by 9: 18 = r
Answer: r = 18
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