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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5/x = -0.2 // + 0.2
3.5/x+0.2 = 0
3.5*x^-1 = -0.2 // : 3.5
x^-1 = -0.05714286
-1 < 0
1/(x^1) = -0.05714286 // * x^1
1 = -0.05714286*x^1 // : -0.05714286
-17.49999913 = x^1
x = -17.49999913
x = -17.49999913
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