SOLUTION: Please solve for x 3/x=(x-4)/7

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Question 317584: Please solve for x
3/x=(x-4)/7
Answer by Alan3354(69443) About Me  (Show Source):
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Please solve for x
3/x=(x-4)/7
Cross multiply
3*7 = x*(x-4)
21 = x^2 - 4x
x%5E2+-+4x+-+21+=+0
(x-7)*(x+3) = 0
x = 7
x = -3