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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3/x = 0.7 // - 0.7
0.3/x-0.7 = 0
0.3*x^-1 = 0.7 // : 0.3
x^-1 = 2.33333333
-1 < 0
1/(x^1) = 2.33333333 // * x^1
1 = 2.33333333*x^1 // : 2.33333333
0.42857143 = x^1
x = 0.42857143
x = 0.42857143
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