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B in (-oo:+oo)
B^3 = 1/343 // - 1/343
B^3-(1/343) = 0
B^3-1/343 = 0
1*B^3 = 1/343 // : 1
B^3 = 1/343
B^3 = 1/343 // ^ 1/3
B = 1/7
B = 1/7
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