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Sagot :
Answer:
5/9
Step-by-step explanation:
x/y = original fraction
x = y-4
y-4+5 / y+5 = 5/7 which is the same as [tex]\frac{y+1}{y+5}[/tex] = [tex]\frac{5}{7}[/tex]
cross-multiply to get:
7(y+1) = 5(y+5)
7y+7 = 5y+25
2y + 7 = 25
2y = 18
y = 9
x = 9-4 or 5
x/y = 5/9
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