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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/8 = 3.5/x // - 3.5/x
4/8-(3.5/x) = 0
4/8-3.5*x^-1 = 0
-3.5*x^-1 = -1/2 // : -3.5
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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