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bilangan pertama = 38 - 2 = 36
bilangan ketiga = 38 + 2 = 40
jumlah bilangan terbesar dan terkecil = 36 + 40 = 76
bilangan kedua = x + 2
bilangan ketiga = x + 2 + 2 = x + 4
x + x + 2 + x + 4 = 144
3x + 6 = 144
3x = 144 - 6
3x = 138
x = 138/3
x = 46
bilangan terbesar = 46 + 4 = 50
jumlah bilangan terkecil dan terbesar = 46 + 50
= 96