$xy-2y-xz+2z$
$\lim_{x\to\infty}\left(\left(\ln\left(x\right)\right)-x\right)$
$x^2y+2xy=3x^2$
$\lim_{x\to0}\left(\frac{x^2-\sin\left(2x\right)+2x}{x^2}\right)$
$10x-9>3x+5$
$-8\cdot3+\left(10\cdot2\right)$
$x\left(x-5\right)^3$
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