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