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m in (-oo:+oo)
m^(4/3)-5 = 620 // - 620
m^(4/3)-620-5 = 0
1*m^(4/3) = 625 // : 1
m^(4/3) = 625
m^(4/3) = 625 // ^ 3
m^4 = 244140625 // ^ 1/4
abs(m) = 125
m = 125 or m = -125
m in { 125, -125 }
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