$3x^2+3y^2=-6$
$14u^2+23u-15$
$2x^2-72x=0$
$\left(8y^{4\:}-4y^3+6\right)-\left(3y^3-5y^2+7\right)$
$s^3-2s^2+3$
$\lim_{x\to\infty}\left(\frac{x^2-1}{x^3+1}\right)$
$2=\frac{x+2}{x-3}$
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