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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

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