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-(b-a) = -(c-b)
a-b = b-c
lalu masukkan
a-b+c = b² - 6
(b-c)+c = b² - 6
b = b² - 6
0 = b² -b -6
0 = (b-3) (b+2)
b=3 atau b=-2
karena b<0 , maka yang memenuhi b=-2