Okay, so -
We have one very important thing here. This little part 6 - (-3).
Now, it's essential to remember that when we have two negatives like this, we simply draw a line straight down. It becomes a positive!
So, our question is essentially 5 + 6 + 3 - 8 + 4 - 3 = ? instead of 5 + 6 - (-3) - 8 + 4 - 3! =)
With that in mind, we simply solve left to right.
11 + 3 - 8 + 4 - 3 = ?
14 - 8 + 4 - 3 = ?
6 + 4 - 3 = ?
10 - 3 = ?
7 is our final answer! =)