Tìm x biết

a)(x+2)(x+3) b)(-5x+2)(-3x+4) c)(2x-1)(x+5x+3) d)(x^2+2x-5)(-2+3x-1) e)(x^2+5x-6):(x-1) g)(-4x^2+8x+12):(x-3)