
The number (x) in: "7 more than twice a number is 339" 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 7, you get 339.
To solve this, you first write the problem as an algebra equation as follows: 2x + 7 = 339
Then you solve the equation by subtracting 7 from both sides, and then divide both sides by 2. Here is the math to illustrate better:
2x + 7 = 339
2x + 7 - 7 = 339 - 7
2x = 332
2x/2 = 332/2
x = 166
Answer = 166
The answer above is correct, because twice 166 is 332, and 7 more than 332 is in fact 339.
More Than Twice a number
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7 more than twice a number is 340
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