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First you need to look at the problem. 12+[(9x4)-(7+9)]x3

Then you follow the order of operations rules, Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction.

Now you start with the first step Parenthesis. 12+[(9x4)-(7+9)]x3

Now that you did that is is time to finish the problem.

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