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12.If 9 is 3 more than twice a number,find the number.

sol:Let the number be x.
9 = ______3_________ + _____2*x____________
6=2*x
x=6/2
x=3
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Ans: the number is 3.

Let the number be x

9 = 3 + 2x

6 = 2x

x = 3