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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/x = 161.25/15 // - 161.25/15
50/x-(161.25/15) = 0
50/x-10.75 = 0
50*x^-1 = 10.75 // : 50
x^-1 = 0.215
-1 < 0
1/(x^1) = 0.215 // * x^1
1 = 0.215*x^1 // : 0.215
4.65116279 = x^1
x = 4.65116279
x = 4.65116279
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