| 16÷8|-|?|+|-7|= 6 true.
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| 16÷8|-|?|+|-7|= 6
=> | 2 | - | ? | + | -7 | = 6
=> 2 - x + 7 = 6
=> x - 7 + 2 = 6
=> x - 9 = 6
=> x = 6 + 9
=> x = 15
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