$z-z^2+z^3-z^4$
$6b+b$
$\left(-x\:+\:500\right)\left(-x+800\right)$
$\lim_{h\to0}\left(\frac{\frac{x+h}{x+h+1}-\frac{x}{x+1}}{h}\right)$
$\frac{dy}{dt}+\frac{1}{t}y=t$
$2y^2+21y-11$
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