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l=(2x-3)
k=38
dit: a. panjang?
b. lebar?
peny: k=2(p+l)
38=2(x+7+2x-3)
38=2(3x+4)
38=6x+8
38-8=6x
6x=38-8
x=30/6=5
a). p=x+7 =5+7=12
b). l=2x-3=2(5)-3=7
smg membntu