2a - 4b + 7 + 8a + 6b -2

To simplify the expression, let's combine like terms:

2a + 8a = 10a
-4b + 6b = 2b

Combining all the like terms, the simplified expression is:

10a + 2b + 7 - 2

The final simplified expression is:

10a + 2b + 5