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dik : U2 = 40
U7 = 25
dit : U10
beda = U7-U2 = (25-40)/(7-2)
= -15/5
= -3
U10 = a + 9b
U7 = a + 6b
U10 = a + 6b + 3b
U10 = U7 + 3b
U10 = 25 +(3.-3)
U10 = 25 -9
= 16pipa
maafkalausalah.nantidieditklausalah~