$5\left(3x-1\right)\le40$

$\lim_{x\to\frac{\pi}{4}}\left(\sqrt{1+\sin\left(\frac{\pi}{2}\tan\left(x\right)\right)}\right)$

$\lim\:_{x\to\:0}\frac{\sqrt{2-x}\:-\sqrt{2}\:\:}{x}$

$27-\left(-18\right)-\left(-72\right)$

$\frac{5x-9}{\left(x-1\right)\left(x-3\right)}=\frac{m}{x-1}+\frac{n}{x-3}$

$-3\left(w-3\right)=2w-21$

$34\:-\:\left(-40\right)$