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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 = 201/(x+4) // - 201/(x+4)
125-(201/(x+4)) = 0
125-201*(x+4)^-1 = 0
125-201/(x+4) = 0
(125*(x+4))/(x+4)-201/(x+4) = 0
125*(x+4)-201 = 0
125*x+299 = 0
(125*x+299)/(x+4) = 0
(125*x+299)/(x+4) = 0 // * x+4
125*x+299 = 0
125*x+299 = 0 // - 299
125*x = -299 // : 125
x = -299/125
x = -299/125
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