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b in (-oo:+oo)
-6 = (1*b)/18 // - (1*b)/18
-((1*b)/18)-6 = 0
-(b/18)-6 = 0
-1/18*b-6 = 0 // + 6
-1/18*b = 6 // : -1/18
b = 6/(-1/18)
b = -108
b = -108
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