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b in (-oo:+oo)
-15/23 = (-5/3)*b // - (-5/3)*b
-((-5/3)*b)-15/23 = 0
(5/3)*b-15/23 = 0
5/3*b-15/23 = 0 // + 15/23
5/3*b = 15/23 // : 5/3
b = 15/23/5/3
b = 9/23
b = 9/23
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