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b in (-oo:+oo)
5/6 = (11/15)*b // - (11/15)*b
5/6-((11/15)*b) = 0
(-11/15)*b+5/6 = 0
5/6-11/15*b = 0 // - 5/6
-11/15*b = -5/6 // : -11/15
b = -5/6/(-11/15)
b = 25/22
b = 25/22
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