9 more than twice a number is 819

The number (x) in: "9 more than twice a number is 819" 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 819.

To solve this, you first write the problem as an algebra equation as follows: 2x + 9 = 819

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 = 819

2x + 9 - 9 = 819 - 9
2x = 810

2x/2 = 810/2
x = 405

Answer = 405

The answer above is correct, because twice 405 is 810, and 9 more than 810 is in fact 819.

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