$\left(2x+1\right)\left(4x^2-2x+1\right)$
$\frac{4^7}{4^0}$
$x^2-9x=-14$
$x^4\left(2x-3x^{-2}\right)$
$\frac{k}{8}+6=20$
$\int\frac{1}{s^2\left(s+1\right)}dx$
$\frac{x^3-4x-10}{x^2-x+6}$
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