n=43. 2n=86 is the same as saying 2 of what is 86? or 2 x n = 86? (replace "of" with x and "is" with =) REad it like an equation. so, 2x43=86 and n=43
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If n = 9 then 2n must be 18.
2n is 2 times n.
'n' can be any number, but when applied to (2n + 4), n = 2.5
They are numbers of the form 2n and 2n+2 where n is any integer.
5 - 2n = 1 4 = 2n n = 2