$\int\left(8x+23\right)^{-2}dx$
$\left(8z+7x\right)\left(8z-7x\right)$
$\lim_{x\to5}\left(\frac{x+3}{2x}\right)^{\frac{x+3}{2x}}$
$4x-x+7-2$
$\frac{x}{2}+3^2$
$436^2707$
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