(2x^2+xy-4x-2y)÷(2-x)
=[ (2x^2-4x) + (xy-2y) ]÷(2-x)
=[ 2x(x-2)+ y(x-2)]÷(2-x)
=(x-2)(2x+y) ÷(2-x)
= - (2x+y)
=-2x-y