Explanation: Just addition and subtraction which is easy, I'd remove the brackets first so it won't be too confusing.
Here, just remember that:
- Plus/Positive multiply Minus/Negative = Minus/Negative
- Plus/Positive multiply Plus/Positive = Positive/Plus
- Minus/Negative multiply Minus/Negative = Positive/Plus
Notice the +(-d+3), (+)(-) = - so it's -d+3
Now just addition and subtraction, for better looking and non-confusing.
9c+2c = 11c
-8d-d = -9d
-6+3 = -3
Therefore, the answer is
If you are confused, you can reply to this explanation (If it's wrong, let me know.)