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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 20/17.5 // - 20/17.5
8/x-(20/17.5) = 0
8/x-1.14285714 = 0
8*x^-1 = 1.14285714 // : 8
x^-1 = 0.14285714
-1 < 0
1/(x^1) = 0.14285714 // * x^1
1 = 0.14285714*x^1 // : 0.14285714
7.00000014 = x^1
x = 7.00000014
x = 7.00000014
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