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Let(x) ( >0) is a particular solution to the differential equation2y"+y-y=(4-6x)e-x, which passes through the origin and the tangent line at the origin is parallel to the X-axis. (I)Find the expression of the curve y =y(x); (II find the maximum distance of the curve y=y(x) from the X-axis; (II) Calculate the integral y(x) dx.