Find the Common Factor in 5z+5: Basic Algebraic Factoring

To find the common factor of the expression $5z+5$, we need to factor each term. The expression can be rewritten as:

$5\cdot z + 5\cdot 1$

The number 5 is common in both terms, as we can see: $\orange 5\cdot z + \orange5\cdot 1$.

Hence, the common factor is $5$.