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b in (-oo:+oo)
2-(b/3) = -4.5 // + 4.5
2-(b/3)+4.5 = 0
6.5-1/3*b = 0 // - 6.5
-1/3*b = -6.5 // : -1/3
b = -6.5/(-1/3)
b = 19.5000002
b = 19.5000002
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