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x in (-oo:+oo)
m-((2/3)*m*m^19*x^2)+(6/2)*m-4 = 0
m+(-2/3)*m^20*x^2+(6/2)*m-4 = 0
-2/3*m^20*x^2 = -(4*m-4) // : -2/3*m^20
x^2 = -3/2*m^-20*(4-(4*m))
x^2 = -3/2*m^-20*(4-4*m) // ^ 1/2
abs(x) = (-3/2)^(1/2)*m^-10*(4-4*m)^(1/2)
x = (-3/2)^(1/2)*m^-10*(4-4*m)^(1/2) or x = -((-3/2)^(1/2)*m^-10*(4-4*m)^(1/2))
x in { (-3/2)^(1/2)*m^-10*(4-4*m)^(1/2), -((-3/2)^(1/2)*m^-10*(4-4*m)^(1/2)) }
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