x^3-7 x^2+-10 x+2 x^2+14 x^2-20

To simplify the given expression, we need to combine like terms.<br /><br />The given expression is:<br />$x^{3}-7x^{2}+(-10x)+2x^{2}+14x^{2}-20$<br /><br />First, let's combine the $x^2$ terms:<br />$x^{3}+(-7x^{2}+2x^{2}+14x^{2})-10x-20$<br />$x^{3}+(-7+2+14)x^{2}-10x-20$<br />$x^{3}+9x^{2}-10x-20$<br /><br />Therefore, the simplified expression is:<br />$x^{3}+9x^{2}-10x-20$