Answer:
First you are to do what is in the parenthesis first:
9 - 6 = 3
The equation is now:
6 * 3 - 23 + 4
Then you do the multiplcation:
6 * 3 = 18
18 - 23 + 4
23 + 4 = 27
27 - 18 = 9
Explanation:
Hope it helps! =D
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