$\left(8x-4y+2\right)+\left(3x+2y-5\right)$
$6b\cdot6b$
$\left(7k-3\right)\left(k^2-2k=7\right)$
$\lim_{y\to1}\left(\frac{c^{1-y}-1}{1-y}\right)$
$x^3+10x^2-22x$
$\sqrt{2+7}$
$\left(25x^9\:-\:15x^8\right)\::\:\left(5x^2\right)$
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