'n' can be any number, but when applied to (2n + 4), n = 2.5
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3n + 9 = 3(n + 3)
3 + 3n = 9 + 2n + 4n n = -2
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.
9 - 5n
It's an algbraic expession in the form of: 2n+4