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M in (-oo:+oo)
(M^4)/3 = 8 // - 8
(M^4)/3-8 = 0
1/3*M^4 = 8 // : 1/3
M^4 = 24
M^4 = 24 // ^ 1/4
abs(M) = 24^(1/4)
M = 24^(1/4) or M = -24^(1/4)
M in { 24^(1/4), -24^(1/4) }
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