Using the order of operation: "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction"
the answer is: ((4 × 5) − 7 − 9) ÷ 3 = 1.33 recurring.
If the order of operation is not followed, a different result:
4 × 5 − 7 − 9 ÷ 3 = 10
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