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b in (-oo:+oo)
(4/6)*b+26.8 = 50.72 // - 50.72
(4/6)*b-50.72+26.8 = 0
2/3*b-23.92 = 0 // + 23.92
2/3*b = 23.92 // : 2/3
b = 23.92/2/3
b = 35.87999982
b = 35.87999982
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