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panjang : 2x + 3
lebar?
K = 2l + 2p
6x + 16 = 2l + 2(2x+3)
6x + 16 = 2l + 4x + 6
6x - 4x + 16 - 6 = 2l
2x + 10= 2l
2x + 10 = l
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2
lebar (l) = x + 5