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54 x 21 = X x (21 - 12)
1134 = 9X
X = 126
jadi pekerja tambahan 126 - 54 = 72 orang
54 . 21 = 1134
12 . 0 = 0
1134 - 0 = 1134 : 42
1134 = 27
= 42