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b in (-oo:+oo)
12 = b/4.6 // - b/4.6
12-(b/4.6) = 0
12-0.2173913*b = 0
12-0.2173913*b = 0 // - 12
-0.2173913*b = -12 // : -0.2173913
b = -12/(-0.2173913)
b = 55.2000011
b = 55.2000011
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