Simplify: (x2−3x+4)−2(x2+x−1)(x^2 - 3x + 4) - 2(x^2 + x - 1)(x2−3x+4)−2(x2+x−1).
−x2−5x+6-x^2 - 5x + 6−x2−5x+6
−x2+x+6-x^2 + x + 6−x2+x+6
3x2−x+23x^2 - x + 23x2−x+2
−x2−5x−6-x^2 - 5x - 6−x2−5x−6