$x^{10}$

$10\cdot x^1$

$x^{15}:x^5$

$x^5+x^5$

$x^{-6}$

$-6\cdot x$

$x^{-22}\cdot x^{16}$

$x^{-2}\cdot x^{-4}$

$(x^{-2})^4$

$x^{-8}$

$\dfrac{1}{x^8}$

$\dfrac{8}{x}$