$z^7\cdot z^4$
$\frac{z^{-4}}{z^2}$
$\int\left(\frac{d}{x^3+x}\right)$
$10x^3-15x$
$\left(5^2+1\right)\left(5^4+1\right)$
$y=3x+5y$
$81a^6+36-108a^3$
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