Answer:
The answer is 7.
Step-by-step explanation:
a = -3
b = 4
Substitute a in 3a for -3 and multiply 3 * -3 to get -9.
Do the same thing with 4b and get 16.
Since -9 is a negative, and 16 is a positive, you essentially just subtract 16 - 9 to get 7.
