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Replace each question mark with one of the four mathematical signs: +, -, x, or /(divide). Each sign can be used only once.

7?5?4?7?6=15

P.S. YOU HAVE TO USE THE ORDER OF OPERATIONS

2 answers

[(7+5)/4]x7-6
Mrs. B is correct and also added parentheses and brackets, which are necessary to clarify the order of operations. The problem should have made that clear.
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