$\left(7k+3\right)\left(7k-3\right)$
$\int\frac{1}{9x^{2\:}}dx$
$10+11\left(11-\left[12+\left(13-14\right)\right]\right)$
$\int\left(\frac{1}{\left(1-y\right)}\right)dy$
$\left(x-3\right)-2\left(2x-2\right)$
$\left(\sqrt{x-1}\right)^2+2\left(\sqrt{x-1}\right)+1$
$\left(-10\right)-\left(-37\right)$
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