Question 499403
The problem occurs when you go from 



36 ÷ 4 (3) + 6 =



to 



36 ÷ 12 + 6 = 



PEMDAS is used starting with "P" (for Parenthesis) and ending with "S" (for Subtraction) and you go from left to right if there are multiple steps for any single given letter or if you're on the same precedence level. 



In the case of 36 ÷ 4 (3) + 6, multiplication and division have the same precedence, so we work left to right to get


36 ÷ 4 (3) + 6
9(3) + 6
27 + 6


Now add to get 33



So 36 ÷ 4(5 - 2) + 6 = 33