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b in (-oo:+oo)
1-(b/3) = -5/2 // + -5/2
1-(b/3)-(-5/2) = 0
5/2-(b/3)+1 = 0
7/2-1/3*b = 0 // - 7/2
-1/3*b = -7/2 // : -1/3
b = -7/2/(-1/3)
b = 21/2
b = 21/2
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