(21x3-23x2-76x-32)/(7x+4) = [3x2(7x4) -5x(7x+4)-8(7x+4)]/(7x+4)=3x2-5x-8
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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
21x + 9 = 180 21x = 180 - 9 21x = 171 x = 171/21 x = 8.143
20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19
3x - 24x + 5 + 3 = -21x + 8
2x2 + 21x + 49 = 2x2 +14x +7x + 49 = 2x(x + 7) + 7(x + 7) = (2x + 7)(x + 7)