Question 1204585
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The order of operations is used to solve the expression


6 + 42 รท 2  -  15 = 12


I thought the answer was 9 because I added 6 + 42 which is 48. Then I divided 48 by 2 which is 24.  
I then subtracted 15 from 24 which is 9. I added first because I thought the PEMDAS was to be solved from left to right.
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Your difficulties started from the fact, that you incorrectly understood the problem.


In part, you incorrectly understood the problem, because its formulation is fault (defective).



The correctly posed question should sound this way


        "Place parentheses in order for the given expression be a valid equality".



Having a correctly formulated problem, its solution is (usually) 
much easier (and has much more sense) than a solution to a problem, posed incorrectly.



In a way, how the problem is posed in the post, there is no doubt 
that it originates from some trash bin.



In more accurate terms, there is no doubt that it originates from an untrusted source.