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18 September, 13:52

30-[ (9*2) - (3*4) ]

- is subtraction

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  1. 18 September, 13:59
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    30-[ (9*2) ] - (3*4) ] first do what's inside the "grouping"

    30 - (18) - (12) you still do the parentheses so 18-12=6 now you're left with 30-6=24 is your answer.
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