$\frac{1}{x},\:a=1$
$\left(-42\right)-\left(-7\right)$
$\left(4m+5n^5\right)^3$
$-15p^{-3}$
$\left(\frac{1}{xy}-xy\right)^2$
$2x^2-10x+8$
$\lim_{x\to-1}\left(\frac{x^4+9x^3+2x+10}{x+1}\right)$
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