Simplify: (x2+x+1)+(2x2−x−1)(x^2 + x + 1) + (2x^2 - x - 1)(x2+x+1)+(2x2−x−1).
3x23x^23x2
3x2+2x3x^2 + 2x3x2+2x
x2x^2x2
3x2+23x^2 + 23x2+2