$\:y'\:+\:y\:=\:e$
$\int-5df$
$\frac{4x+1}{x-1}=\frac{12}{x^2-1}+3$
$a^2b-ab^2c^2+abc^3$
$\frac{b^{2\:}-9b-7}{b^2}$
$5x+8<0$
$5x^3-20x$
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