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penyebut = y
x + y = 38
x = 38 - y
x - 4/y - 4 = 3/7
38 - y - 4/y - 4 = 3/7
34 - y/y - 4 = 3/7
238 - 7y = 3y - 12
238 + 12 = 3y + 7y
250 = 10y
y = 25
x + y = 38
x + 25 = 38
x = 13
Pecahan tsb = 13/25