Please Excuse My Dear Aunt Sally
Working from left to right, do Parentheses first, then Exponents, then Multiplications and Divisions, and finally, Additions and Subtractions.
The first operation is Multiplication, so 4*11 = 44
44 - 5 + 12
The next operation is Subtraction (tied with Addition in rank):
39 + 12
51
Please Excuse My Dear Aunt Sally
Working from left to right, do Parentheses first, then Exponents, then Multiplications and Divisions, and finally, Additions and Subtractions.
The first operation is Multiplication, so 4*11 = 44
44 - 5 + 12
The next operation is Subtraction (tied with Addition in rank):
39 + 12
51