( x − 9 ) : 2 = 4 x − 9 = 4 ∗ 2 x − 9 = 8 x = 8 + 9 x = 17
x − n u mb er 2 x − 9 = 4 ∣ M u lt i pl y b y 2 x − 9 = 8 ∣ A dd 9 x = 17 N u mb er i s 17.
The unknown number is 17. This is determined by solving the equation formed by the given conditions of the problem. When 9 is subtracted from the number and divided by 2, it equals 4, leading us to find that the number is 17.
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