The sum of numerator and denominator of a fraction is three less than twice denominator. if each numerator and denominator is decreased by 1 the fraction becomes 1/2. Find the fraction.
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X+y=2y-3
=x-y=-3
x-1/y-1=1/2
2x-2=y-1
2x-y=1
by elimination solve them
X=4
y=7
the fraction is 4/7
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