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b in (-oo:+oo)
2-(b/3) = -5/2 // + -5/2
2-(b/3)-(-5/2) = 0
5/2-(b/3)+2 = 0
9/2-1/3*b = 0 // - 9/2
-1/3*b = -9/2 // : -1/3
b = -9/2/(-1/3)
b = 27/2
b = 27/2
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