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b in (-oo:+oo)
b/10 = 0.1 // - 0.1
b/10-0.1 = 0
1/10*b-0.1 = 0 // + 0.1
1/10*b = 0.1 // : 1/10
b = 0.1/1/10
b = 1
b = 1
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