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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2*m-(12/m) = 10/7 // - 10/7
2*m-(12/m)-(10/7) = 0
2*m-12*m^-1-10/7 = 0
2*m^1-12*m^-1-10/7*m^0 = 0
(2*m^2-10/7*m^1-12*m^0)/(m^1) = 0 // * m^2
m^1*(2*m^2-10/7*m^1-12*m^0) = 0
m^1
2*m^2+(-10/7)*m-12 = 0
2*m^2+(-10/7)*m-12 = 0
DELTA = (-10/7)^2-(-12*2*4)
DELTA = 4804/49
DELTA > 0
m = ((4804/49)^(1/2)-(-10/7))/(2*2) or m = (-(-10/7)-(4804/49)^(1/2))/(2*2)
m = ((4804/49)^(1/2)+10/7)/4 or m = (10/7-(4804/49)^(1/2))/4
m in { (10/7-(4804/49)^(1/2))/4, ((4804/49)^(1/2)+10/7)/4}
m in { (10/7-(4804/49)^(1/2))/4, ((4804/49)^(1/2)+10/7)/4 }
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