$y'-2x=2xy^2$
$38abc-18ab+54bc$
$\lim_{x\to\infty}\left(\frac{7x-3}{7x+5}\right)^{-7x+2}$
$-4x^2-20x-9$
$\left(x\:-\:\frac{1}{3}\right)^2$
$\frac{f+4}{32}=\frac{1}{f}$
$-5+4n=-17$
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