$y'+2xy-y=4x-2$
$\int\:\frac{5}{2x^3+6x^2}dx$
$\frac{x+3}{5}=1$
$\lim_{x\to\frac{x}{4}}\frac{\cos^2x}{\sqrt{2}}$
$36x^2-216x$
$\frac{9}{6}+\frac{3a}{6}$
$\frac{18a^2}{2a^2}$
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