(3x+2(2x-1)-(5x-2(x-4)=6х^2-3х+4х-2-(5х^2-20х-2х+8)=6х^2-3х+4х-2-(5х^2-22х+8)=6х^2-3х+4х+2-5х^2+22х-8=х^2+23х-10
(3x+2(2x-1)-(5x-2(x-4)=6х^2-3х+4х-2-(5х^2-20х-2х+8)=6х^2-3х+4х-2-(5х^2-22х+8)=6х^2-3х+4х+2-5х^2+22х-8=х^2+23х-10