Which of the following equals (5x2+3x−1)−(5x2−3x+1)(5x^2 + 3x - 1) - (5x^2 - 3x + 1)(5x2+3x−1)−(5x2−3x+1)?
6x−26x - 26x−2
10x2−210x^2 - 210x2−2
6x+26x + 26x+2
−6x+2-6x + 2−6x+2