$\left(\left(5\:+\:21\::\:\left(-3\right)\right)\right)$

$dx+\left(2+x-y\right)dy=0$

$\lim_{x\to3}\:\frac{\left(\arccosh\left(x\right)-\arccosh\left(3\right)\right)}{x-3}$

$6x^2y-13x^2y+8^2y-x^2y$

$\left(+3\right)-\:\left(+5\right)-\:\left(-9\right)+\left(-23\right)+\left(+4\right)$

$s^2+16s+49=0$

$-4\left(3m+5n\right)-2\left(-7m+12n\right)$