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a = 3
U15 = 143 menjadi
a + 14b = 143
3 + 14b = 143
14b = 140
b = 14
b.
b = 15
U21 = 295 menjadi
a + 20b = 295
a + 20 x 15 = 295
a + 300 = 295
a = 295 - 300 = -5