$\sqrt{169k^2a}$
$2\cdot\left(3+5\right)+7$
$\ln\left(3x\left(2x+3\right)^{3x-2}\right)$
$0-3x^2$
$\lim_{x\to2}\left(\frac{x^2-4}{\sqrt{x-2}-2}\right)$
$-2+5\cdot7$
$1x^2+7x+14$
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