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