$\frac{x^2+2x}{x^2-6x+9}$
$3x\:+4\:<\:22$
$a+4=8$
$-2\cdot0-1$
$\left(\frac{w^5x^{-2}y}{w^2xy^4}\right)^3$
$20+900$
$9w^3+4w-w^3$
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