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D( m )
m^2 = 0
m = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
6/m-(2/m)-4-4 = 60/(m^2)-16 // - 60/(m^2)-16
6/m-(2/m)-(60/(m^2))-4-4+16 = 0
6/m-2*m^-1-60*m^-2-4-4+16 = 0
4*m^-1-60*m^-2+8 = 0
t_1 = m^-1
4*t_1^1-60*t_1^2+8 = 0
4*t_1-60*t_1^2+8 = 0
DELTA = 4^2-(-60*4*8)
DELTA = 1936
DELTA > 0
t_1 = (1936^(1/2)-4)/(-60*2) or t_1 = (-1936^(1/2)-4)/(-60*2)
t_1 = -1/3 or t_1 = 2/5
t_1 = -1/3
m^-1+1/3 = 0
1*m^-1 = -1/3 // : 1
m^-1 = -1/3
-1 < 0
1/(m^1) = -1/3 // * m^1
1 = -1/3*m^1 // : -1/3
-3 = m^1
m = -3
t_1 = 2/5
m^-1-2/5 = 0
1*m^-1 = 2/5 // : 1
m^-1 = 2/5
-1 < 0
1/(m^1) = 2/5 // * m^1
1 = 2/5*m^1 // : 2/5
5/2 = m^1
m = 5/2
m in { -3, 5/2 }
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