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B in (-oo:+oo)
81 = (1/3)*B^9 // - (1/3)*B^9
81-((1/3)*B^9) = 0
(-1/3)*B^9+81 = 0
-1/3*B^9 = -81 // : -1/3
B^9 = 243
B^9 = 243 // ^ 1/9
B = 243^(1/9)
B = 243^(1/9)
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