$m^2-2m+6$
$2x^2+6$
$2f+1-2f$
$xy-2x$
$\left(1+6-4\right)-\left(-4+2+3\right)$
$\frac{dx}{dt}-3x=8$
$\lim_{x\to1}\left(x^{-\frac{9}{lnx}}\right)$
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