$$\frac{ { \left(y+y \right) }^{ 2 } - { z }^{ 6 } }{ (x+y)- { z }^{ 3 } }$$
$\frac{4y^{2}-z^{6}}{x+y-z^{3}}$
$$\frac{\left(2y\right)^{2}-z^{6}}{x+y-z^{3}}$$
$$\frac{2^{2}y^{2}-z^{6}}{x+y-z^{3}}$$
$$\frac{4y^{2}-z^{6}}{x+y-z^{3}}$$
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