$\frac{dy}{dx}\left(x^2+3x-xy+y^2=x+y\right)$
$\lim_{x\to\infty}\frac{45x^3+9x^2-6x}{25-9x^2}$
$\int-16xdx$
$\:x\:-\:12\:>\:20$
$1+14^2y+49x^4$
$\frac{a^3-2a^2+a}{a}$
$\frac{2x^4-3x^3-5x+2}{2x+1}$
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