In a fraction, if the numerator is decreased by 1 and the denominator is increased by 1,
In a fraction, if the numerator is decreased by 1 and the denominator is increased by 1, then the fraction becomes 1/2. Instead, if the numerator is increased by 1 and the denominator is decreased by 1, then the fraction becomes 4/5. Find the numerator of the fraction.
A) 2
B) 7
C) 4
D) 10
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