4 more than twice a number is 643

The number (x) in: "4 more than twice a number is 643" 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 4, you get 643.

To solve this, you first write the problem as an algebra equation as follows: 2x + 4 = 643

Then you solve the equation by subtracting 4 from both sides, and then divide both sides by 2. Here is the math to illustrate better:

2x + 4 = 643

2x + 4 - 4 = 643 - 4
2x = 639

2x/2 = 639/2
x = 319.5

Answer = 319.5

The answer above is correct, because twice 319.5 is 639, and 4 more than 639 is in fact 643.

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4 more than twice a number is 644
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