$u+81=106$
$5m\:-\:3t\:\:+\:m\:\:-\:3t$
$4x^2+8x-10=0$
$\lim_{t\to x}\left(-\frac{5}{\left(x-7\right)^2}\right)$
$\frac{1}{1}-\frac{2}{x}$
$\frac{3x^3-18x^2+29x-4}{x^3-3x^2+4}$
$a^2+6a+8=0$
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