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b in (-oo:+oo)
2*b-(3.4/0.6) = 9.7 // - 9.7
2*b-(3.4/0.6)-9.7 = 0
2*b-9.7-5.66666667 = 0
2*b-15.36666667 = 0 // + 15.36666667
2*b = 15.36666667 // : 2
b = 15.36666667/2
b = 7.68333334
b = 7.68333334
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