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b in (-oo:+oo)
-6 = (12/3)*b-4 // - (12/3)*b-4
4-((12/3)*b)-6 = 0
4-4*b-6 = 0
-4*b-2 = 0 // + 2
-4*b = 2 // : -4
b = 2/(-4)
b = -1/2
b = -1/2
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