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As there are no parentheses then the expression stated can be simplified as follows :-

7x - 4x - 9 = 3x - 9

If the parentheses were placed (7x - 4x) - 9 then the result would be the same.

If the parentheses were placed 7x - (4x - 9) = 7x - 4x + 9 = 3x + 9.

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