6x(5+7)/4-7x2+3x3 i am using PEMDAS and coming up with -5 but the right answer according to the TEAS Test book that I am studying is 13. Please explain why that this is the right answer.

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6x(5+7)/4-7x2+3x3 = 6x(12)/4-14+9 =18-14+9 =13

So if subtraction comes first instead of the addition you do it ?

It doesn't matter which order you do addition and subtraction since they are actually the same function (subtraction is like adding a negative number). In your equation above, you can do the addition step first, though note you are adding 9 to -14, not 14. You will get the same answer. Side note: similarly, multiplication and division are similar functions since division is like multiplying by a reciprocal.

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