Answer:
14
Step-by-step explanation:
To get the mean, you have to add all the numbers together, and then divide them by how many numbers there are. Here, i'll show you.
There are 6 numbers, including
, which we need to find out.
The Equation: 
- We can simplify this equation into,

To find
, we can do the inverse, and multiply
by
.
(The 6 on the left side of the equation is then cancelled out)
For this final equation to be true,
would have to equal
.
<em>Hope the rest of your math goes well :)</em>