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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
80/x = 15/100 // - 15/100
80/x-(15/100) = 0
80/x-3/20 = 0
80*x^-1 = 3/20 // : 80
x^-1 = 3/1600
-1 < 0
1/(x^1) = 3/1600 // * x^1
1 = 3/1600*x^1 // : 3/1600
1600/3 = x^1
x = 1600/3
x = 1600/3
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