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jika α = β + γ
α + (β + γ) = 12 --> 2α = 12 --> α = β + γ = 6
.
α β + βγ + αγ = 28
6β +β γ +6 γ = 28
6β +6 γ+β γ = 28
6(β+ γ) +β γ = 28
6(6) +β γ= 28
β γ = 28- 36= - 8
.
αβ γ = -n
6(-8) = - n
n = 48
6(64)= -n
n = - 384