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x3+3x2+3x+2 divided by x+2 equals x2+x+1
x2 + 3x + 2 factors into (x + 1) (x + 2)
x2 + 3x + 7 = 5 ∴ x2 + 3x + 2 = 0 ∴ (x + 1)(x + 2) = 0 ∴ x ∈ {-2, -1}
-2
(x - 1)(x - 2)