$-\left(3+5\right)+\left(2-3\right)$

$\left(\sqrt{2^{\left(x-1\right)}}\right)\cdot\left(\frac{1}{2}\right)^x$

$\left(a^2\right)^{-2}$

$8x^3+9+11x^3-11x^3$

$-\left[x+\left\{-\left(x+y\right)-\left[-x+\left(y-z\right)-\left(-x+y\right)\right]-y\right\}\right]$

$4y^2+4y$

$16\:a^2m^3p^6\:+\:28m^5p^2\:-\:8\:a^2mp^6\:\:$