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P - 20 = L
L = (P - 20)
2 ( P + L ) = Keliling
2 ( P + L) = 240
P + L = 240 /2
P +( L) = 120
P + (P - 20 ) = 120
2P = 120 + 20
2P = 140
P = 140/2 = 70m
jadi panjangnya = 70m