To find how much less each month James makes than Matt, we'll start by solving the given equation:
\[ 12(80 - x) = 816 \]
- First, divide both sides of the equation by 12 to simplify:
\[ 80 - x = \frac{816}{12} \]
Calculating \(\frac{816}{12}\):
\[ \frac{816}{12} = 68 \]
So now our equation becomes:
\[ 80 - x = 68 \]
- Next, isolate \(x\) by subtracting 68 from 80:
\[ -x = 68 - 80 \]
This simplifies to:
\[ -x = -12 \]
- Multiplying both sides by -1 gives:
\[ x = 12 \]
Thus, \(x\) represents how much less per month James makes than Matt, which is:
\[ \boxed{12} \]
Now, to find out how much James earns each month, we calculate it using the value of \(x\):
James's monthly earnings:
\[ 80 - x = 80 - 12 = 68 \]
Therefore, James earns:
\[ \boxed{68} \]
In summary, James makes $12 less each month than Matt, and he earns $68 each month.