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b in (-oo:+oo)
238.206 = 5.8*(1/3)*b // - 5.8*(1/3)*b
238.206-(5.8*(1/3)*b) = 0
238.206-1.93333333*b = 0
238.206-1.93333333*b = 0 // - 238.206
-1.93333333*b = -238.206 // : -1.93333333
b = -238.206/(-1.93333333)
b = 123.21000021
b = 123.21000021
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