$32.57-28.3$

$f\left(x\right)=-x^2-8x-20$

$16\:-\:81x^4$

$\frac{n^{24}}{27}+125y^{33}$

$\lim_{n\to\infty}\left(7\sqrt{\frac{19n+19}{2}}\right)$

$\left[+6+9-\left(+48-65\right)-\left(-9-8\right)\right]\:-\:\left[-45\:-53-\left(+14+17\right)\right]+|+56-78|$

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