-4-(-6)= 2
negative and negative cancel out to make a positive
so it would be -4+6=2. Also, you can rearrange the equation to 6-4=2, you keep the sign with the number.
-4 - -6 = x
There are so many subtraction symbols that this problem can look confusing but you can get rid of two of them. When you subtract from a negative you are really just adding. (Think of debt as a negative number, if you subtract debt that really means you are getting richer so you are actually adding)
So the problem can also be written as:
-4 + 6 = x
Now you can add the two numbers together to get
x = 2