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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 8.4 // - 8.4
2/x-8.4 = 0
2*x^-1 = 8.4 // : 2
x^-1 = 4.2
-1 < 0
1/(x^1) = 4.2 // * x^1
1 = 4.2*x^1 // : 4.2
0.23809524 = x^1
x = 0.23809524
x = 0.23809524
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