To simplify the expression \((-8) + (-6) + (-9999999)(-8) + (-6) + (-9999999)\), let's break it down step by step.

1. The first part of the expression is:
\[
(-8) + (-6) = -8 - 6 = -14
\]

2. The second part involves the multiplication:
\[
(-9999999)(-8) = 9999999 \times 8 = 79999992
\]

3. Now add the results together:
- From the first part, we have \(-14\).
- From the multiplication, we have \(79999992\).
- Now including \(-6\) again, and the last \(-9999999\):
\[
(-14) + 79999992 + (-6) + (-9999999)
\]
Which simplifies to:
\[
79999992 - 14 - 6 - 9999999
\]

4. Now calculate step by step:
- First, add the negatives:
\[
-14 - 6 = -20
\]
- Then include the \(-9999999\):
\[
-20 - 9999999 = -10000219
\]

5. Finally, combine everything:
\[
79999992 - 10000219 = 69999773
\]

Thus, the final result is:
\[
\boxed{69999773}
\]