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b in (-oo:+oo)
b*((40*b^7-(60*b))/20) = 0
b*((40*b^7-60*b)/20) = 0
(b*(40*b^7-60*b))/20 = 0
40*b^7-60*b = 0
20*b*(2*b^6-3) = 0
2*b^6 = 3 // : 2
b^6 = 3/2
b^6 = 3/2 // ^ 1/6
abs(b) = (3/2)^(1/6)
b = (3/2)^(1/6) or b = -(3/2)^(1/6)
20*b*(b-(3/2)^(1/6))*(b+(3/2)^(1/6)) = 0
(20*b*b*(b-(3/2)^(1/6))*(b+(3/2)^(1/6)))/20 = 0
( 20*b )
20*b = 0 // : 20
b = 0
( b+(3/2)^(1/6) )
b+(3/2)^(1/6) = 0 // - (3/2)^(1/6)
b = -(3/2)^(1/6)
( b-(3/2)^(1/6) )
b-(3/2)^(1/6) = 0 // + (3/2)^(1/6)
b = (3/2)^(1/6)
( b )
b = 0
b in { 0, -(3/2)^(1/6), (3/2)^(1/6), 0 }
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