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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 6.7 // - 6.7
2/x-6.7 = 0
2*x^-1 = 6.7 // : 2
x^-1 = 3.35
-1 < 0
1/(x^1) = 3.35 // * x^1
1 = 3.35*x^1 // : 3.35
0.29850746 = x^1
x = 0.29850746
x = 0.29850746
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