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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/x = 30/100 // - 30/100
50/x-(30/100) = 0
50/x-3/10 = 0
50*x^-1 = 3/10 // : 50
x^-1 = 3/500
-1 < 0
1/(x^1) = 3/500 // * x^1
1 = 3/500*x^1 // : 3/500
500/3 = x^1
x = 500/3
x = 500/3
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