SOLUTION: 7/2=R/R-15

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Question 119067: 7/2=R/R-15
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
7/2 = R/(R-15)
Cross-multiply to get:
7R-105 = 2R
5R = 105
R = 21
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Cheers,
Stan H.