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b in (-oo:+oo)
-2*b-(2/3) = -5/3 // + -5/3
-2*b-(2/3)-(-5/3) = 0
5/3-2*b-2/3 = 0
1-2*b = 0 // - 1
-2*b = -1 // : -2
b = -1/(-2)
b = 1/2
b = 1/2
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