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K = 2(P+L)
50= 2((2X+7)+ ( 3X-2))
50 = 2(5X +5)
50 = 10X +10
50-10= 10X
40: 10 =X
4 = X
P= 2(4)+7
P= 15
L = 3(4) -2
L=10
JADI LUASNYA = 15 X 10
L= 150