$-2+\left|-5-\left(2-\left(4+2\right)+1\right)-1\right|$

$\frac{36m^2-5^2}{6m-5}$

$\frac{5.6}{1.6}$

$5\left(3a-21\right)$

$9-\left(2-5\right)+\left(3-1-2\right)-4-7$

$\lim_{x\to-3}\left(\frac{4ln\left(2x+7\right)}{2tain\left(-6-2x\right)}\right)$

$6\left(x-3\right)-3\left(2x-7\right)$