it is 2n -n because in meiosis a diploid 2n becomes a haploid n.
If you mean: 2n = 5-2 then n = 1.5
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Meiosis produces haploid gametes which have the ' n ' symbol.
If you mean: 4n-2n = 4 then 2n = 4 and n = 2
n * 2n = 2n2
3n - 2n = n 3n - 2n = (3 - 2)n = 1n = n
14-2n = 12
If you mean 2n+4, or 2n-4, that already is an algebraic expression. The idea might be to put it into words. 2n+4 is twice n, increased by 4. Notice you need a comma because if you write twice n increased by 4 this is 2(n+4)
2n2 / n = 2n
7-2n=n-147-2n+2n=n-14+2n7=3n-147+14=3n21=3n21/3=3n/37=n
If the number is n, then twice the number is 2n and the sum of the two is n + 2n = 3n.