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m in (-oo:+oo)
((2*m)/8)*m^2-(8*m) = 0
((2*m)/8)*m^2-8*m = 0
1/4*m^3-8*m = 0
m*(1/4*m^2-8) = 0
1/4*m^2 = 8 // : 1/4
m^2 = 32
m^2 = 32 // ^ 1/2
abs(m) = 4*2^(1/2)
m = 4*2^(1/2) or m = -(4*2^(1/2))
m = 0
m = 0
m in { 4*2^(1/2), -(4*2^(1/2)), 0 }
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