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b in (-oo:+oo)
b/0.7-12 = -6.5 // + 6.5
b/0.7-12+6.5 = 0
1.42857143*b-5.5 = 0 // + 5.5
1.42857143*b = 5.5 // : 1.42857143
b = 5.5/1.42857143
b = 3.85
b = 3.85
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