$20a;a=7$
$x^2+13x=-40$
$\left(\frac{1}{\sqrt{x}}y\right)'$
$x^2-2x+25$
$\lim_{x\to2}\left(\frac{6e^x}{x}\right)$
$17+5x>13-15x$
$5x^2-9+46$
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