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b in (-oo:+oo)
-(2*b)-4/5 = 0
-2*b-4/5 = 0
-2*b-4/5 = 0 // + 4/5
-2*b = 4/5 // : -2
b = 4/5/(-2)
b = -2/5
b = -2/5
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