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