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b in (-oo:+oo)
b/(-12) = 1.9 // - 1.9
b/(-12)-1.9 = 0
-1/12*b-1.9 = 0 // + 1.9
-1/12*b = 1.9 // : -1/12
b = 1.9/(-1/12)
b = -22.80000091
b = -22.80000091
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