$776+546$
$2y-x+xy=2$
$\frac{1+n^{-1}}{1-n^{-2}}$
$\left(x+\frac{2}{y}\right)dy+ydx=0$
$xy^{3}-2x^{2}y^{2}+8xy^{2}$
$50-50\left[3-3\left(4-4\cdot2\right)-5+5\cdot2\right]$
$4x^2+12xy+6y^2$
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