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Ingat rumus keliling persegi panjang: K = 2p + 2l
=> K = 2p + 2l
=> 32 = 2(2x - 5) + 2(x - 6)
=> 32 = 4x - 10 + 2x - 12
=> 32 = 6x - 22
=> 54 = 6x, maka x = 9.