$3x^2-6x-4$
$2x+6x$
$\frac{48x^22-74xy+28y^2}{8x-7}$
$\left(3m^2+4mn3\right)^4$
$15x^5-20x^4\:\:$
$\left(y^2+2xy+3x^2\right)dx+\left(2xy+x^2+3y^2\right)dy=0$
$\frac{2}{5}x+5-\frac{1}{5}x-3$
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