$-4x^2+5x+1=0$
$7\cdot\left(-9+10\right)$
$14+\left|23-\left(34-57\right)\right|$
$\left(3x-4\right)\left(2y+1\right)$
$\frac{dy}{dx}\left(y-x=2\sqrt{xy}\right)$
$7+3x<19$
$\frac{3x^3+x^2+2}{x^4+2x^2+1}$
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