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