$( x ^ { 2 } + x - 2 ) ( - x + 3 )$

$\frac{x+5y}{2}+\frac{3x+5y}{3}$

$\log_{\frac{1}{8}}\left(\log_{\frac{1}{4}}\left(\log_{\frac{1}{2}}\left(x\right)\right)\right)=\frac{1}{3}$

$u^2-27u+50$

$-8\:x\:-5\:x\:1\:x\:-1$

$4x-4-x+2$

$\lim_{x\to0}\left(\frac{49n^2}{\left(4n^2+7\right)}\right)$