$dx-e^{-2x}dy=0$
$\frac{8x^4+2^3+x^2}{2x^2+x}$
$3y^3-y-5-6y+5+6y^3$
$a+b+ab;\:a=1;\:b=-1$
$5\:sin\:\theta\:+3=3$
$-+845+-442$
$\frac{25x}{5x^2yz^2}$
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