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b in (-oo:+oo)
-2/3 = b/6 // - b/6
-(b/6)-2/3 = 0
-1/6*b-2/3 = 0 // + 2/3
-1/6*b = 2/3 // : -1/6
b = 2/3/(-1/6)
b = -4
b = -4
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