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m in (-oo:+oo)
2/3 = m^42 // - m^42
2/3-m^42 = 0
-1*m^42 = -2/3 // : -1
m^42 = 2/3
m^42 = 2/3 // ^ 1/42
abs(m) = (2/3)^(1/42)
m = (2/3)^(1/42) or m = -(2/3)^(1/42)
m in { (2/3)^(1/42), -(2/3)^(1/42) }
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