$-4z+31\ge17z+23$
$\frac{x+3}{x}-\frac{x}{x-2}=-1$
$\lim_{x\to\infty}\left(\frac{e^{-x}}{x}\right)$
$5x+9=2x\:-12$
$2\cdot3^2+3\cdot5$
$2^{2^{2^{2^2}}}$
$a^3a^3$
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