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b in (-oo:+oo)
b/0.8 = 12.6 // - 12.6
b/0.8-12.6 = 0
1.25*b-12.6 = 0 // + 12.6
1.25*b = 12.6 // : 1.25
b = 12.6/1.25
b = 10.08
b = 10.08
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