$\frac{4v^4}{v^4}$
$\left(z^2-3z+3\right)-2\left(z-1\right)$
$2888+42$
$9\cdot22$
$\frac{4n^2}{2n^2}$
$4n^3\cdot5n^3$
$9z-6z-1$
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