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b in (-oo:+oo)
-23/4 = (63/5)*b // - (63/5)*b
-((63/5)*b)-23/4 = 0
(-63/5)*b-23/4 = 0
-63/5*b-23/4 = 0 // + 23/4
-63/5*b = 23/4 // : -63/5
b = 23/4/(-63/5)
b = -115/252
b = -115/252
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