$\left(5x^3+4x^2+2x-8\right)-\left(2x^2+9x-8\right)$

$35x^2-x-2=0$

$\left(7k-3\right)\left(k^2-2k=7\right)$

$\lim_{x\to9}\left(\left(x+2\right)\sin\left(\frac{1}{x-9}\right)\right)$

$3\left(6h\right)$

$\left(6m^6+7n^5\right)+\left(8m^6-2n^5\right)$

$\lim\:_{x\to\:\infty\:}\frac{\left(ax^2+bx+c\right)}{dx^2+ex+f}$