$\lim_{x\to0}\left(\frac{x\cdot7^x}{7^x-1}\right)$
$\left(10x-5x^2+20x^5-12\right)\left(4x+5\right)$
$8n+3\left(-n-3\right)$
$\frac{1}{2x^{-5}}$
$\left(x-2\right)^5$
$\int e^54xdx$
$\left(8z+n\right)\left(8z-n\right)$
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