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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
71.25/x = 80/100 // - 80/100
71.25/x-(80/100) = 0
71.25/x-4/5 = 0
71.25*x^-1 = 4/5 // : 71.25
x^-1 = 0.01122807
-1 < 0
1/(x^1) = 0.01122807 // * x^1
1 = 0.01122807*x^1 // : 0.01122807
89.06250139 = x^1
x = 89.06250139
x = 89.06250139
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