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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
147 = (206*x+202)/(x+3) // - (206*x+202)/(x+3)
147-((206*x+202)/(x+3)) = 0
(-1*(206*x+202))/(x+3)+147 = 0
(-1*(206*x+202))/(x+3)+(147*(x+3))/(x+3) = 0
147*(x+3)-1*(206*x+202) = 0
239-59*x = 0
(239-59*x)/(x+3) = 0
(239-59*x)/(x+3) = 0 // * x+3
239-59*x = 0
239-59*x = 0 // - 239
-59*x = -239 // : -59
x = -239/(-59)
x = 239/59
x = 239/59
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