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x in (-oo:+oo)
((7/21)*x^6)/20 = m // - m
((7/21)*x^6)/20-m = 0
1/60*x^6 = m // : 1/60
x^6 = 60*m
x^6 = 60*m // ^ 1/6
abs(x) = 60^(1/6)*m^(1/6)
x = 60^(1/6)*m^(1/6) or x = -(60^(1/6)*m^(1/6))
x in { 60^(1/6)*m^(1/6), -(60^(1/6)*m^(1/6)) }
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