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=-4b+3a
b. (2x^2*y-6xy^2)/(x^2-8xy+15y^2)=2xy(x-3y)/((x-3y)(x-5y))
=2xy/(x-5y)
= 6b - 7b - 3b = -2a + 5a = 3a
= -4b
= -4b + 3a