$-7\cdot\left(-3x^2+6x-9\right)$
$x4-2x-3$
$\left(\frac{\sqrt[2]{k}}{\sqrt[2]{n}}\right)\left(\frac{1}{n}\right)$
$\left(7p^4\right)^2$
$\lim_{x\to-\infty}\:\sqrt{x^2-x}-x$
$1-8t^5+16t^{10}$
$\left(1.2\right)\left(2\right)^{-1}$
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