$10+-20+80$
$\frac{7}{x},\:a=-3$
$\frac{x^2-2x+3}{x-2}\cdot\:\frac{2x+3}{x+6}$
$125x^6-8y^3$
$4x^2-8xy-4y^2$
$a^{x^3}^{-2}\cdot2x$
$\lim_{x\to0}\left(\frac{e^x-1}{x^7+4x}\right)$
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