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b in (-oo:+oo)
5/6 = (-7/15)*b // - (-7/15)*b
5/6-((-7/15)*b) = 0
(7/15)*b+5/6 = 0
7/15*b+5/6 = 0 // - 5/6
7/15*b = -5/6 // : 7/15
b = -5/6/7/15
b = -25/14
b = -25/14
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