$7^X+7^{X+1}+7^{X+2}=2793$
$\frac{a^4b^5c^6}{a^6b^4c^2}$
$10.24x^2-12.80x+4.0=0$
$\frac{m^2+4}{m^2-2}$
$\left|-3\right|-\left|3\right|$
$5x+5;\:x=2$
$\lim_{x\to-0.0001}\frac{sin3x}{tan2x}$
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