$\lim_{x\to3}\left(\frac{x-3}{ln\left(x-3\right)}\right)$
$27^2$
$2.3ab-\frac{1}{2}b^2$
$\:a^5.a^3$
$x-2+2x-3x+5-8x$
$\lim_{x\to-1}\:\frac{x^3+1}{x^2+1}$
$25m^4-15m^3+5m^2$
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