$\frac{2x^3-3x}{x^2-1}$
$\:160.\:x\:-\:\left(200+\:80x\:+\:x\:\right)\:>\:1000$
$12x^2-6y^2$
$81x^2+10x-9$
$\frac{d}{dx}y^2-x^2=6x+5$
$-14\:+2\left(9\:+\:6\cdot\:3\right)$
$3x^2-12x^2+9x$
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