9 more than twice a number is 878

The number (x) in: "9 more than twice a number is 878" 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 878.

To solve this, you first write the problem as an algebra equation as follows: 2x + 9 = 878

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 = 878

2x + 9 - 9 = 878 - 9
2x = 869

2x/2 = 869/2
x = 434.5

Answer = 434.5

The answer above is correct, because twice 434.5 is 869, and 9 more than 869 is in fact 878.

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9 more than twice a number is 879
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