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72 = 2(5x-1) + 2(2x+2)
72 = 10x - 2 + 4x + 4
72 = 14x + 2
72-2 = 14x
70 = 14x
x = 5
panjang = 5x-1 = 5.5 - 1 = 24 cm
lebar = 2x+2 = 2.5+2 = 12 cm