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b in (-oo:+oo)
b/(-0.3) = 30 // - 30
b/(-0.3)-30 = 0
-3.33333333*b-30 = 0 // + 30
-3.33333333*b = 30 // : -3.33333333
b = 30/(-3.33333333)
b = -9.00000001
b = -9.00000001
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