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3a + 2j = 90
3(j+5) + 2j = 90
3j + 2j = 90-15
j = 75/5 = 15
a = 15+5 = 20
a + 2j = 20 + 2x15 = 50
harga sekilo apel & 2 kilo jeruk = Rp. 50.000
2 kg jeruk = 75.000
5.000 + 75.000 = Rp80.000.00