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i think the error was he was suppose to add 49 - 36 to get to 33

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The mistake is that he went right to left

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The problem is that he is moving right to left

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so what you have to do is 49-36 then 36+20

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the mistake was he added when he need to subtract first which he had to do 49-36 and than add 13+20

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The mistake was that you went to right to left or that you missed up a problem.

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The mistake is that in GEMDAS addition and subtraction come last but it what matters most is which one comes first. So the error is that the person added before he subtracted which is why the answer turned out to be -7 when it was really 33.

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He was supposed to go left to right
He needed to subtract 49 and 36 to get 33.

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The mistake is, he/she went right to left and not left to right. The persons mistake was at the end and they should have done 49-36, not 36+20.

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The mistake is that he /she went to right to left, he/she had to go left to right.

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The mistake was when right to left instead of left to right so what they had to do was 49-36 then 13-56.

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The mistake is he went right to left he had to do 49-36 then 13-56

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The mistake was when you added 36+20 when you had to subtract 49-36 first because you have to go left to right. So then the problem goes like 49-36=13 and then 13+20=33. So the correct answer is 33.