$\frac{2}{5x}-2\le-\:0$
$3x^2-18x+81$
$6y^3-7x^2+4+4x-1-5y^3+x^2$
$\frac{2x^2+10+12}{x+1}$
$4dy+xdx=x^2dy$
$20x^2+30x^2$
$\frac{dy}{dx}=\sqrt{2-y^2}$
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