Find the next number in the given number series:
$126,112,98,84,70,\_\_\_\_\_\_\_\_\_\_\_\_\_\_,$

The sequence shows a steady linear decreasing shift:
$$112-126=-14$$

$$98-112=-14$$

$$84-98=-14$$

$$70-84=-14$$

The fixed common difference is $-14$. Following this pattern:

$$\text{Next value}=70-14=56$$