SOLUTION: If 3x+4:x+5 is the duplicate ratio of 8:15, find x.

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Question 1089963: If 3x+4:x+5 is the duplicate ratio of 8:15, find x.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%283x%2B4%29%2F%28x%2B5%29=8%2F15
15%283x%2B4%29=8%28x%2B5%29
45x%2B60=8x%2B40
37x=-20
Solve for x.