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b in (-oo:+oo)
b/4.3-4.7 = -1.42 // + 1.42
b/4.3-4.7+1.42 = 0
0.23255814*b-3.28 = 0 // + 3.28
0.23255814*b = 3.28 // : 0.23255814
b = 3.28/0.23255814
b = 14.10399997
b = 14.10399997
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