Well, most of this has already been answered, but one answer was extremely simple while the other was rather....lengthy.
Start with your order of operations: PEMDAS, or Parentheses (), Exponents 2, Multiplication *, Division /, Addition +, and lastly Subtraction. But you have to remember that once you hit Multiplication/Division and Addition/Subtraction, it's LEFT TO RIGHT in ORDER. I.e, if there is a question like: 5 - 3 * 6 + 1, you'd first do the (3*6), because Multiplication is first. Next, you'd do the Subtraction because of the Left To Right thing.
So for this problem,
(-3*2) = 6
(6+-4) = 2
(2--5) = 7**
**If you SUBTRACT a negative from a positive, then it is the same thing as adding a positive.
Hope this helped!
Also, if the parentheses were there in the original problem, then whizkid is correct, but if you added them to just box the negatives, then I'm correct.