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b in (-oo:+oo)
-((5/6)*b)-2 = 0
(-5/6)*b-2 = 0
-5/6*b-2 = 0 // + 2
-5/6*b = 2 // : -5/6
b = 2/(-5/6)
b = -12/5
b = -12/5
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