((1-x)'*(3x-6)-(3x-6)'(1-x))/(3x-6)^2
(1-x)'=-x
(3x-6)'=3
(-3x^2+9x-3)/(3x-6)^2
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((1-x)'*(3x-6)-(3x-6)'(1-x))/(3x-6)^2
(1-x)'=-x
(3x-6)'=3
(-3x^2+9x-3)/(3x-6)^2