$\left(a+5\right)\left(a-3\right)$
$169^2-196^2$
$3x^2\left(2+x^3\right)^2$
$\left(2x^{2\:-x+2}\right)$
$\frac{\left(2m^2-3mn+5m+3n-7m\:\right)}{m-1}$
$422,0234+1285,07$
$x^{4\:}y^2\:z^3;\:si=4,\:y\:=3,\:z\:=\:\frac{1}{2}$
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