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8x = 12x15
x = 180/8 = 22,5 = 23
8 15 hari
x 12 hari
= 8/x x 15/12
15x = 8.12
15x = 96
x = 96/15 = 6,4 ( 6 ) jadi 6- 8 = -2 / 2 orang pekerja yang perlu di tambahkan