$2\cdot2+3$
$3x^{2}+2x^{2}-3x$
$y'-xy=1-x$
$a^2-12a+24$
$\lim_{h\to25}\frac{2h}{\sqrt{625-h^2}}$
$\frac{2}{x-2}+\frac{1}{x+2}-3=0$
$\frac{2x^2-13x+3}{x-3}$
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