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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.5/x = 7/5 // - 7/5
8.5/x-(7/5) = 0
8.5/x-7/5 = 0
8.5*x^-1 = 7/5 // : 8.5
x^-1 = 0.16470588
-1 < 0
1/(x^1) = 0.16470588 // * x^1
1 = 0.16470588*x^1 // : 0.16470588
6.07142866 = x^1
x = 6.07142866
x = 6.07142866
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