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b in (-oo:+oo)
2-(b/3) = -1/2 // + -1/2
2-(b/3)-(-1/2) = 0
1/2-(b/3)+2 = 0
5/2-1/3*b = 0 // - 5/2
-1/3*b = -5/2 // : -1/3
b = -5/2/(-1/3)
b = 15/2
b = 15/2
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