Final answer to the problem
$2\left(z+3\right)$
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Step-by-step Solution
Specify the solving method
1
Combining like terms $z$ and $z$
$2z+6$
2
Factor the polynomial $2z+6$ by it's greatest common factor (GCF): $2$
$2\left(z+3\right)$
Final answer to the problem
$2\left(z+3\right)$