$7x\left(3x-2\right)-8\left(3x-2\right)$
$6^2+8$
$5t+\:2;\:t=0$
$50xy^2-4x^2$
$\lim_{x\to3}\left(\frac{x^2-3x-6}{x-3}\right)$
$\sec^4\left(a\right)-\sec^2\left(a\right)$
$\left(16\cdot0.25\right)+\left(13\cdot0.2\right)+\left(0.3\cdot14\right)$
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