The equation to represent the problem is:
8 + 2x = 9
Where x is the unknown number.
To solve for x, we first need to isolate it on one side of the equation.
8 + 2x = 9
Subtract 8 from both sides:
2x = 1
Finally, divide both sides by 2:
x = 1/2
Therefore, the unknown number is 1/2.
Eight more than double a number is nine
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