SOLUTION: The ratio of twice a number TO 9 less than that number IS 5 to 4 . What was the original number ?

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Question 1019361: The ratio of twice a number TO 9 less than that number IS 5 to 4 . What was the original number ?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call the number, x. Then we set up a proportion
2x%2F%28x-9%29+=+5%2F4
Now cross-multiply and solve this...we get
5(x-9) = 4(2x)
5x - 45 = 8x
-45 = 3x
x = -15