$8+3d-5d+7$

$x^2-10x+21=0$

$\int\frac{x^4+1}{\left(x^2-x+2\right)\left(x+1\right)}dx$

$12\:-\:17\:+\:8\:+\:31\:-\:15\:+\:4\:-\:82\:-\:42\:+\:16\:+\:1\:$

$-23xyz-7xyz$

$\frac{d^4}{dx^4}\left(4x^3-7x^2+3x-9\right)$

$6log8\left(2\right)+\frac{log8\left(64\right)}{3log8\left(4\right)}$