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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.
Thanks for watching :)