$\frac{5x^2}{x^3-3x^2+3x-1}$
$13x+3y-4z=21$
$9+5+4$
$-5\cdot32$
$\int-4e^{2x+3}dx$
$4x\:+7\:y\:-\:42\:=\:0\:$
$1+\left(\frac{1}{x+1}\right)^2$
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