Simplify by combining like terms: 5x2+3x−2x2+7x−45x^2 + 3x - 2x^2 + 7x - 45x2+3x−2x2+7x−4
3x2+10x−43x^2 + 10x - 43x2+10x−4
3x2+10x+43x^2 + 10x + 43x2+10x+4
7x2+10x−47x^2 + 10x - 47x2+10x−4
3x2−4x−43x^2 - 4x - 43x2−4x−4