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M in (-oo:+oo)
(M^4)/3-5 = 620 // - 620
(M^4)/3-620-5 = 0
1/3*M^4 = 625 // : 1/3
M^4 = 1875
M^4 = 1875 // ^ 1/4
abs(M) = 5*3^(1/4)
M = 5*3^(1/4) or M = -(5*3^(1/4))
M in { 5*3^(1/4), -(5*3^(1/4)) }
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