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l = 1/2(3x-5y)
k = 2(p+l)
k = 2((3x-5y)+1/2(3x-5y))
k = 2(3/2(3x-5y))
k = 3(3x-5y) = 9x-15y
L = p x l
L = (3x-5y) x (3x/2 - 5y/2)
L = 9x^2 / 2 - 15xy/2 - 15xy/2 + 25y^2 /2
L = 9x^2 / 2 -30xy/2 + 25y^2 / 2