$-2m+3n-6:3m-8n:-5m+24y+2z$
$x^2\left(x+1\right)+x+1$
$\frac{b^2-1}{b^2+2b+1}$
$y''+2y'+2y=0$
$\left(\frac{3^{-1}ab^{-9}}{5^{-1}a^{-3}b-12c}\right)$
$\lim_{x\to0}\ln\left(\frac{1+5x}{x}\right)$
$-6\cos^2x+2\cos x+2=3\cos x$
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