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b in (-oo:+oo)
-(5*b)-9/10 = 23/30 // - 23/30
-(5*b)-9/10-(23/30) = 0
-5*b-9/10-23/30 = 0
-5*b-5/3 = 0 // + 5/3
-5*b = 5/3 // : -5
b = 5/3/(-5)
b = -1/3
b = -1/3
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