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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1983/x = -0.016 // + 0.016
1983/x+0.016 = 0
1983*x^-1 = -0.016 // : 1983
x^-1 = -0.00000807
-1 < 0
1/(x^1) = -0.00000807 // * x^1
1 = -0.00000807*x^1 // : -0.00000807
-123915.73729864 = x^1
x = -123915.73729864
x = -123915.73729864
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