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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5 = 6/x // - 6/x
3.5-(6/x) = 0
3.5-6*x^-1 = 0
-6*x^-1 = -3.5 // : -6
x^-1 = 0.58333333
-1 < 0
1/(x^1) = 0.58333333 // * x^1
1 = 0.58333333*x^1 // : 0.58333333
1.71428572 = x^1
x = 1.71428572
x = 1.71428572
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