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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100-(4*(100/x)) = 83 // - 83
100-(4*(100/x))-83 = 0
100-400*x^-1-83 = 0
-400*x^-1 = -17 // : -400
x^-1 = 17/400
-1 < 0
1/(x^1) = 17/400 // * x^1
1 = 17/400*x^1 // : 17/400
400/17 = x^1
x = 400/17
x = 400/17
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