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x² +6x +6x +36 = 0
(x² +6x) +(6x +36) = 0
x(x +6) +6(x +6) = 0
(x +6) (x +6) = 0
x +6 = 0
x = -6
x₁ = x₂
Maka,
x Ι {x = -6 atau x = -6}
Jadi, jawabannya adalah D.