$\left(-49\right):\left(+7\right)$
$\left(\frac{2}{2-x}\right)^3$
$\left(8x\right)^3$
$4.5^54.5^3$
$\lim_{x\to\infty}\left(\left(e^x+1\right)^{\left(-\frac{2}{x}\right)}\right)$
$\left(18x+2\right)\left(18x-5\right)$
$px+py+qx+qy$
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