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b in (-oo:+oo)
b/0.05 = 5.3 // - 5.3
b/0.05-5.3 = 0
20*b-5.3 = 0 // + 5.3
20*b = 5.3 // : 20
b = 5.3/20
b = 0.265
b = 0.265
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