$4x+3y^2-7z^4+5z^4+11-4x+y^2$
$\left(\frac{a^5\cdot a^2\cdot a}{a\cdot a^3}\right)$
$2y-y+7-1+3+7x^2-4y$
$\left(\frac{9a^{-6}b^2}{17a^3b^{-2}}\right)^0$
$x^5\:e^3x$
$\frac{3}{x^2-x-2}$
$\left(3x^7y^5\right)^{-4}\left(7x^4y^8\right)$
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