$2x^2-3y^2=4$
$x^2-12x+29$
$3x^2+6x-2$
$16^a=4^{2a+3}$
$\lim_{x\to5}\left(\frac{x+3}{2x}\right)^{\frac{x+3}{x}}$
$112+0-+28$
$890-523-35$
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