$m^4+2m^2+9$
$x^2-2x-14=0$
$53.6-4.93$
$25y^4-30y^2+9$
$\frac{2x^2y-5z}{3x};\:x=2;\:y=\frac{1}{2};\:z=5$
$2\sqrt{x}-8$
$\lim_{x\to\infty}\left(\frac{3x^3-11}{24x-9}\right)$
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