$$4 { z }^{ 2 } -4 { z }^{ 2 } +4 { z }^{ 2 } +4 { z }^{ 2 } -xyz+xyz-zy { y }^{ 2 } +zy { y }^{ 2 } \times 20$$
$z\left(19y^{3}+8z\right)$
$$z\left(4z-4z+4z+4z-xy+xy-yy^{2}+20yy^{2}\right)$$
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