$-4\left(z+3\right)-4\left(5\:-\:4z\right)$
$2\left(-7+4a\right)$
$46y-48y-46y$
$7n^5.2n^4$
$\frac{b^{-1}}{b^{-7}}$
$24\:-\:\left(-49\right)$
$9x^4yz^2+33z^4$
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