$\left(-5x^{-3}\right)\left(7x^{\frac{2}{3}}\right)$
$\frac{x}{3x^5}$
$10\cdot2-15\cdot1$
$8.5\cdot41$
$\left(x+7\right)\left(x-8\right)+\left(2x+6\right)\left(2x-6\right)$
$x\:cos\left(y+z\right)=1$
$\lim_{x\to0}\left(\frac{x^2-5x+6}{x-2}\right)$
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