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D( m )
4*m-(29*m) = 0
4*m-(29*m) = 0
4*m-(29*m) = 0
4*m-29*m = 0
-25*m = 0 // : -25
m = 0
m in (-oo:0) U (0:+oo)
m = (27.5-83.75)/(4*m-(29*m)) // - (27.5-83.75)/(4*m-(29*m))
m-((27.5-83.75)/(4*m-(29*m))) = 0
m-((27.5-83.75)/(4*m-29*m)) = 0
m+(-56.25*(-1))/(-25*m) = 0
(-25*m*m)/(-25*m)+(-56.25*(-1))/(-25*m) = 0
-25*m*m-56.25*(-1) = 0
56.25-25*m^2 = 0
(56.25-25*m^2)/(-25*m) = 0
(56.25-25*m^2)/(-25*m) = 0 // * -25*m
56.25-25*m^2 = 0
-25*m^2 = -56.25 // : -25
m^2 = 2.25
m^2 = 2.25 // ^ 1/2
abs(m) = 2.25^(1/2)
m = 2.25^(1/2) or m = -2.25^(1/2)
m in { 2.25^(1/2), -2.25^(1/2) }
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