Simply 5a-8c+b+3c-9a+6b

To simplify the expression 5a - 8c + b + 3c - 9a + 6b, we can combine like terms by combining the coefficients of the same variable.

Combining like terms, we have:
(5a - 9a) + (-8c + 3c) + (b + 6b)

Simplifying further, we get:
-4a - 5c + 7b