$84x-172$

$x^2-3x\ge0$

$\frac{x+2}{x^2+x-6}$

$\lim_{x\to0}\left(\frac{x-\arctan x}{x-\arcsec x}\right)$

$\lim_{x\to\infty}\left(\frac{x+2}{x-2}\right)^x$

$x+\frac{7}{2}y-z-\left(7x-\left(-\frac{1}{2}y+2z-\left(\frac{16}{3}x-y+5z\right)+3z\right)\right)$

$3\left(x+2y\right)-12+x$