Answer:
-2a-2
Explanation:
We can start solving this expression by combining like terms: Constants, or the number values, and Variables(the letters)
We can combine -6, 4, and 0 to get -2. 
We can combine 3a and -5a to get -2a. 
-2a + (-2) is the expression we are left with. 
We can simplify this to 
 -2a - 2. 
It can't be simplified further, so our answer is 
-2a-2.