Q: What is the common denominator for 2n plus 1 and 3n-4?

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You can't. 17 + 2n = 21 + 2n gives: 2n = 4 + 2n which gives 0=4 which is not possible so the sum is not solveable.

Exactly that. 2n+2.

(2n + 7)(2n + 7)

2n + 19 = -7 2n = -7 - 19 2n = -26 n= -13

It can be simplified to: 9m-2n

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2n + 4m - 2n + m = 5m

2n plus 4 = 2n + 4

4n

7+2n

You can't. 17 + 2n = 21 + 2n gives: 2n = 4 + 2n which gives 0=4 which is not possible so the sum is not solveable.

(2n + 7)(2n + 7)

5n = 2n + 3n .

Exactly that. 2n+2.

15m + (2n-6m) + 11m = = 15m + 11m + 2n - 6m = 26m - 6m + 2n = 20m + 2n = 2(10m + n)

That factors to (2n + 1)(n + 2)

18n + 27 or 9(2n + 3)

12m + 2n - 3m + 11n = 9m + 13n