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= -3/5(20x(x+y) -15y(x+y))
= -3/5(20x(x) + 20x(y) -15y(x) -15y(y))
= -3/5(20x^2+20xy-15xy-15y^2)
= -3/5(20x^2+5xy-15y^2)
= -12x^2-3xy+9y^2