SOLUTION: If x-9:3x+6 is the duplicate ratio of 4:9, find x.

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Question 1089964: If x-9:3x+6 is the duplicate ratio of 4:9, find x.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28x-9%29%2F%283x%2B6%29=4%2F9
4%283x%2B6%29=9%28x-9%29
Take it from there.