9 more than twice a number is 864

The number (x) in: "9 more than twice a number is 864" is what we are solving here.

In other words, you are looking for a number (x) that if you multiply it by two (same as twice) and then add 9, you get 864.

To solve this, you first write the problem as an algebra equation as follows: 2x + 9 = 864

Then you solve the equation by subtracting 9 from both sides, and then divide both sides by 2. Here is the math to illustrate better:

2x + 9 = 864

2x + 9 - 9 = 864 - 9
2x = 855

2x/2 = 855/2
x = 427.5

Answer = 427.5

The answer above is correct, because twice 427.5 is 855, and 9 more than 855 is in fact 864.

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9 more than twice a number is 865
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