Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered.
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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/3 = 4 2n = 3*4 2n = 12 n = 6 :)
It can be simplified to: 9m-2n