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18 = 2(x+2) + 2(x+5)
18 = 2x + 4 + 2x + 10
18 - 4 - 10 = 2x + 2x
4 = 4x
x = 1
panjang -> x + 2 = 1 + 2 = 3
lebar -> x + 5 = 1 + 5 = 6