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3x²-12x+12-48=0
3x²-12x-36=0
(3x-18)(x+2)
3x-18=0 x+2=0
x=18/3=6 x=-2
jadi Hp= {-2,6} (c)
x - 2 = -4
x = -4 + 2
x = -2
x - 2 = 5
x = 4 + 2
x = 6
HP = { -2, 6 }