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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.69/x = 7.13 // - 7.13
1.69/x-7.13 = 0
1.69*x^-1 = 7.13 // : 1.69
x^-1 = 4.21893491
-1 < 0
1/(x^1) = 4.21893491 // * x^1
1 = 4.21893491*x^1 // : 4.21893491
0.23702665 = x^1
x = 0.23702665
x = 0.23702665
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