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3x, 4x, dan 5x. selisih
5x - 3x = 14
2x = 14
x = 7
keliling = 3x + 4x + 5x = 3(7) + 4(7) + 5(7) = 21 + 28 + 35 = 84
sisi pertama : 3/2 . 14 = 21
sisi kedua : 4/2 . 14 = 28
sisi ketiga : 5/2 . 14 = 35