$\frac{x^8}{a^{9x+9}}$
$\int_0^{\infty}\left(axe^{-a}\right)dx$
$12x^3+18x^2-10x$
$9\:+\:12n\:=\:12n\:+\:9$
$\int_0^{\infty}\left(\frac{4}{5\left(x^2+2x+2\right)}\right)dx$
$7x-7\cdot x-9$
$\int\frac{2x+18}{x^2+10x+24}dx$
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