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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.5/x = 4.25/1.7 // - 4.25/1.7
8.5/x-(4.25/1.7) = 0
8.5/x-2.5 = 0
8.5*x^-1 = 2.5 // : 8.5
x^-1 = 0.29411765
-1 < 0
1/(x^1) = 0.29411765 // * x^1
1 = 0.29411765*x^1 // : 0.29411765
3.39999997 = x^1
x = 3.39999997
x = 3.39999997
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