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m in (-oo:+oo)
(3*m^2)/8 = 6 // - 6
(3*m^2)/8-6 = 0
3/8*m^2 = 6 // : 3/8
m^2 = 16
m^2 = 16 // ^ 1/2
abs(m) = 4
m = 4 or m = -4
m in { 4, -4 }
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