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kedua =karena ganjil, x+2
persamaannya
x+x+2 = 56
2x+2 = 56
2x = 54
x = 27
sub .
bilangan pertama = x = 27
kedua = x + 2 = 27+2 = 29
pembuktian 27+29 = 56
berarti sebelum dan sesudah 28 adalah 27 dan 29