$$3z^{2}+3z^{2}+4z$$
$2z\left(3z+2\right)$
$$z\left(3z+3z+4\right)$$
$$6z+4$$
$$2\left(3z+2\right)$$
$$2z\left(3z+2\right)$$
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$$6z^{2}+4z$$