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b in (-oo:+oo)
b/3.4 = 18.6 // - 18.6
b/3.4-18.6 = 0
0.29411765*b-18.6 = 0 // + 18.6
0.29411765*b = 18.6 // : 0.29411765
b = 18.6/0.29411765
b = 63.23999937
b = 63.23999937
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