$\left(k-7\right)\left(k-12\right)$
$\left(5\right)+\left(9\right)+\left(5\right)$
$\sqrt[2]{16}-4^2\cdot\left(8+7\right)-10$
$\frac{\left(x^2-x+3\right)}{x-2}$
$\int\sin^3\left(\frac{x}{3}\right)dx$
$x^4+3x^3-11x^2-12x+28$
$2x^2-x\:+5\:\:;x=8$
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