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

To simplify the expression 5a - 8c + b + 3c - 9a + 6b, we group the like terms together:

(5a - 9a) + (-8c + 3c) + (b + 6b)

This simplifies to:

-4a - 5c + 7b