$2a^2-4a+3$
$\lim\:_{n\to\:\infty\:}\left(7\:+\left(\frac{1}{2}\right)^n\right)$
$5x^2y-8xy^2-9y^3;\:x=2;\:y=-1$
$60x-x^2-900=0$
$5x-3\:2\le7$
$m^2+14mn$
$-5+7+9+1+8$
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