Me! i'm not that great at math.

This is actually easier than it looks.
Just subtract the second equation from the first, and you will have the answer. Try to group like terms together while subtracting. ^ means a power.
Here is the process:
9x^3 - 5x^3 + 2x^2 - 5x - (-7x) + 4 - 4
Now, just simplify this by combining like terms. Remember that two negatives make a plus.
4x^3 + 2x^2 + 2x is the answer.

The answer is 10. and if you go by pemdas you would 1. multiplication 2. division 3. addition 4. subtraction