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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X-6)/25 = 15/x // - 15/x
(X-6)/25-(15/x) = 0
(X-6)/25-15*x^-1 = 0
(X-6)/25-15/x = 0
(x*(X-6))/(25*x)+(-15*25)/(25*x) = 0
x*(X-6)-15*25 = 0
X*x-6*x-375 = 0
X*x-6*x-375 = 0
-6*x-375 = 0 // + 375
-6*x = 375 // : -6
x = 375/(-6)
x = -125/2
x+125/2 = 0
(x+125/2)/(25*x) = 0
(x+125/2)/(25*x) = 0 // * 25*x
x+125/2 = 0
x+125/2 = 0 // - 125/2
x = -125/2
x = -125/2
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