100000*789:1899393*637384993927666*g6-1872:h8%7

To solve the expression you've provided step by step, it's important to break it down and clarify what each part is referring to.

1. The expression is somewhat unclear, as it mixes arithmetic operations with what seem to be variable or function representations (g6, h8). I'm going to assume you want to perform the numerical calculations only and treat the g6 and h8 as variables.

2. Let's calculate the numerical part first:

   \[ 100000 \times 789 = 78900000 \]

   Next, for the division and multiplication:

   \[ 1899393 \times 637384993927666 \]

   This multiplication will yield a very large number. Calculating that: \[ 1899393 \times 637384993927666 = 1.20984798995355 \times 10^{18} \]

3. Continuing with the complete expression as is might yield results depending on the values of g6 and h8. Since you haven't provided specific values for these variables, I'll denote them as they are.

4. The expression as a whole (with variables included but leaving them unsolved) looks like:

   \[ \frac{78900000}{1.20984798995355 \times 10^{18}} \cdot g6 - \frac{1872}{h8} \% 7 \]

5. If you need further simplification or to solve for h8 or g6, please provide those values, and I can assist with that!

Let me know how you would like to proceed!