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1,5 b² + 0,75 b +0,125 - 0,875 =0
1,5 b² + 0,75 b - 0,75 = 0
kalikan 4
6 b² + 3b - 3 = 0
2b² +b -1 = 0
(2b -1)(b+1) = 0
b = 1/2 atau b = -1