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b in (-oo:+oo)
b/(-3) = 1.5 // - 1.5
b/(-3)-1.5 = 0
-1/3*b-1.5 = 0 // + 1.5
-1/3*b = 1.5 // : -1/3
b = 1.5/(-1/3)
b = -4.50000005
b = -4.50000005
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