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= 4x + 3y - 2x - 5y =
= 4x -2x +3y - 5y =
= 2x - 2y=
= 2(x-y)
3(3x-5y)-2(6y-2x)=
= 9x - 15y - 12y +4x=
= 9x +4x - 15y - 12y =
= 13x - 27y
(4x+3)(x-3)+x(5-2x)=
= 4x^2 -12x +3x - 9 + 5x -2x^2 =
= 4x^2 -2x^2 - 12x +3x +5x - 9=
= 2x^2 - 4x - 9