$\frac{x^2-81}{x-9}$
$-78-10-478$
$\frac{4m+1}{m^2+5m+4}-\frac{7}{m^2+3m+2}$
$y'+\left(x+2\right)y=0$
$\lim_{x\to+0}\left(\frac{x^2+4x}{\sqrt{x^3+2x}}\right)$
$20xy2-20xy-15x$
$\lim_{x\to0}\left(x^{\left(6sin\left(x\right)\right)}\right)$
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