Answer:
-48
Step-by-step explanation:
Parenthesis
Exponents
Multiply
Divide
Add
Subtract
If you have a tie, go left to right.
This is the order you solve ALL problems in such situations.
21 + 12 - (35-8) *3
21 + 12 - 27 * 3
21 + 12 - 81
33 - 81 = -48
To reiterate:
1. Solve parenthisis. (35-7) = 27.
2. Multiply. 27 * 3 = 81
3. Add. 21 + 12 = 33
4. Subtract. 33 - 81 = -48