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b in (-oo:+oo)
2*b-(3.5/0.6) = -28 // + 28
2*b-(3.5/0.6)+28 = 0
2*b-5.83333333+28 = 0
2*b+22.16666667 = 0 // - 22.16666667
2*b = -22.16666667 // : 2
b = -22.16666667/2
b = -11.08333334
b = -11.08333334
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