What's the missing number?

5+3-6-8+4-?= -9

To find the missing number in the equation 5 + 3 - 6 - 8 + 4 - ? = -9, we can rearrange the given numbers and solve for the missing number.

First, let's group the given numbers together:
5 + 3 - 6 - 8 + 4 = ? - 9

Next, let's simplify the left side of the equation:
(5 + 3) + (-6) + (-8) + 4 = ? - 9
8 - 6 - 8 + 4 = ? - 9
6 - 8 + 4 = ? - 9
2 - 8 = ? - 9
-6 = ? - 9

Now, to find the value of the missing number, we need to isolate the missing number on one side of the equation. To do this, we can add 9 to both sides of the equation:
-6 + 9 = ? - 9 + 9
3 = ?

Therefore, the missing number in the equation 5 + 3 - 6 - 8 + 4 - ? = -9 is 3.