Your question is incomplete.
21x + 2 = [?]
Whatever one does to one side they must do to the other so even if you divided by X you would have:
23 = ?/X
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21x + 9 = 180 21x = 180 - 9 21x = 171 x = 171/21 x = 8.143
(7x + 7)(x + 2) = 7x2 + 21x + 14
2x2 + 21x + 49= 2x2 + 14x + 7x + 49= 2x(x + 7) + 7(x + 7)= (x + 7)(2x + 7)
20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19
2x2 + 21x + 49 = 2x2 +14x +7x + 49 = 2x(x + 7) + 7(x + 7) = (2x + 7)(x + 7)