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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
125 = (225*x+201)/(x+4) // - (225*x+201)/(x+4)
125-((225*x+201)/(x+4)) = 0
(-1*(225*x+201))/(x+4)+125 = 0
(-1*(225*x+201))/(x+4)+(125*(x+4))/(x+4) = 0
125*(x+4)-1*(225*x+201) = 0
299-100*x = 0
(299-100*x)/(x+4) = 0
(299-100*x)/(x+4) = 0 // * x+4
299-100*x = 0
299-100*x = 0 // - 299
-100*x = -299 // : -100
x = -299/(-100)
x = 299/100
x = 299/100
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