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sisi 2: (3x+2) -> ada sepasang sisi
keliling: 42
42 = 2(2x-1) + 2(3x+2)
42 = 4x-2+6x+4
42+2-4 = 10x
40 = 10x
x = 4
sisi1 : (2x-1) = 8-1 = 7
sisi2 : (3x+2) = 12+2 = 14
tinggal pilih sisinya yang mana