Rebecca R. answered 10/02/18
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Experienced Elementary Math, Prealgebra, Algebra 1, and Geometry Tutor
Hi, Delilah.
The difference of 9 and 6 means "9 - 6"
So the expression you need is:
2(9 -6) - 3
= 2(3) - 3
= 6 - 3 = 3