Parentheses
Exponents
Multiplication Multiplication and division can both go first depending on Division which one comes first from left to right
Addition
Subtraction Addition and subtraction can both go first depending on which one comes first from left to right
3 - 3 * 6 + 2 <---- Original
3 - 18 + 2 <-----First you multiply
-15 + 2 <----- Next you subtract
-13 <----- Than you add, and you get your answer
Your answer : -13
I Attatched a picture of a graphing calculator