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b in (-oo:+oo)
5/7 = 5*b // - 5*b
5/7-(5*b) = 0
5/7-5*b = 0
5/7-5*b = 0 // - 5/7
-5*b = -5/7 // : -5
b = -5/7/(-5)
b = 1/7
b = 1/7
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