The numerator of a fraction is 4 less than its denominator. If the numerator and
denominator are both decreased by 1, the new fraction becomes 5/17. Find the original
fraction.
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(x-4-1) /(x-1) =5/17
17(x-4-1) =5(x-1)
17x-68-17= 5x-5
12x = -5+17+68
x =80/12
=20/3
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