Those two expressions have no common factor. Therefore, the common denominator is the product of both. Normally you would keep this factored (don't do the actual multiplication, just indicate both factors in the denominator).
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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)
It can be simplified to: 9m-2n
2n + 19 = -7 2n = -7 - 19 2n = -26 n= -13