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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50 = 100*((42.03-x)/x) // - 100*((42.03-x)/x)
50-(100*((42.03-x)/x)) = 0
50-100*x^-1*(42.03-x) = 0
50-100*x^-1*(42.03-x) = 0
150-4203*x^-1 = 0
150-4203*x^-1 = 0
-4203*x^-1 = -150 // : -4203
x^-1 = 50/1401
-1 < 0
1/(x^1) = 50/1401 // * x^1
1 = 50/1401*x^1 // : 50/1401
1401/50 = x^1
x = 1401/50
x = 1401/50
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