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