9 more than twice a number is 816

The number (x) in: "9 more than twice a number is 816" 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 816.

To solve this, you first write the problem as an algebra equation as follows: 2x + 9 = 816

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 = 816

2x + 9 - 9 = 816 - 9
2x = 807

2x/2 = 807/2
x = 403.5

Answer = 403.5

The answer above is correct, because twice 403.5 is 807, and 9 more than 807 is in fact 816.

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9 more than twice a number is 817
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