$5x^2+8x+1=0$
$\lim_{x\to\infty}\left(\frac{6x^2+5x}{7x^3+7x+5}\right)$
$\left(\frac{3}{5}z^{10}-2z^5\right)\left(\frac{3}{5}z^{10}+2z^5\right)$
$y^2-12y=3$
$\frac{1}{sin^2x-cos^2x}$
$\frac{15}{16}x^4-\frac{21}{40}x^3-\frac{9}{28}x$
$5+8x<3x+30$
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