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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
200/x = 60/100 // - 60/100
200/x-(60/100) = 0
200/x-3/5 = 0
200*x^-1 = 3/5 // : 200
x^-1 = 3/1000
-1 < 0
1/(x^1) = 3/1000 // * x^1
1 = 3/1000*x^1 // : 3/1000
1000/3 = x^1
x = 1000/3
x = 1000/3
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