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b in (-oo:+oo)
2.61 = b/3 // - b/3
2.61-(b/3) = 0
2.61-1/3*b = 0 // - 2.61
-1/3*b = -2.61 // : -1/3
b = -2.61/(-1/3)
b = 7.83000008
b = 7.83000008
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