$-3z\:-\:\left(-z\:-\:2\right)$
$m^8-18m^4n$
$\int\frac{1}{\left(x^2+49\right)^5}dx$
$\left(\frac{1}{2}p^3\right)\left(4p^{-7}\right)$
$\frac{1}{8}x=5$
$\frac{5^2}{5^{-3}}$
$15x^5y^2-24x^4y^3+9x^3y^4$
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