Simplify the expression: x2+3x+2x2−xx^2 + 3x + 2x^2 - xx2+3x+2x2−x.
3x2+2x3x^2 + 2x3x2+2x
3x2+4x3x^2 + 4x3x2+4x
2x2+2x2x^2 + 2x2x2+2x
5x5x5x