$-9-7-8-2+5+4+11$
$y=\ln\left(\frac{3-2x}{3+2x}\right)$
$\lim_{x\to\infty}\left(\frac{2x^3-5x^2+7}{8x^2+3x-1}\right)$
$4+-21+2$
$12c-9-c+9$
$\frac{1}{4}-3x<13+\frac{1}{2}x$
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