Rút gọn biểu thức: 3x(4x - 3) - (x + 1)^2 - (11x^2 - 12); 5y(2y - 1) - (3y + 2)(3 - 3y)

3x(4x-3)-(x+1)^2-(11x^2-12)
5y(2y-1)-(3y+2)(3-3y)
(6x^3-x^2+5x-3):(2x-1)
(3x+1)^2+12x-(3x+5)^2+2(6x+3)
(-3x^3+5x^2-9x+15):(-3x+5)
(4x^2-9y^2):(2x-3y)
(x-5)(2x+3)-2x(x-3)+x+7
(x+1)(x^2-x+1)-x(3+x)(x+5)
(x^4-3x^3+4x^2-12x):(x^2+4)
(-2x^2-4x+1)(2x-3x^2)