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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/3 = 4700/x // - 4700/x
100/3-(4700/x) = 0
100/3-4700*x^-1 = 0
-4700*x^-1 = -100/3 // : -4700
x^-1 = 1/141
-1 < 0
1/(x^1) = 1/141 // * x^1
1 = 1/141*x^1 // : 1/141
141 = x^1
x = 141
x = 141
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