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b in (-oo:+oo)
9^2 = (1/2)*b^6 // - (1/2)*b^6
9^2-((1/2)*b^6) = 0
(-1/2)*b^6+9^2 = 0
-1/2*b^6 = -81 // : -1/2
b^6 = 162
b^6 = 162 // ^ 1/6
abs(b) = 162^(1/6)
b = 162^(1/6) or b = -162^(1/6)
b in { 162^(1/6), -162^(1/6) }
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