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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.3/x = 7 // - 7
6.3/x-7 = 0
6.3*x^-1 = 7 // : 6.3
x^-1 = 1.11111111
-1 < 0
1/(x^1) = 1.11111111 // * x^1
1 = 1.11111111*x^1 // : 1.11111111
0.9 = x^1
x = 0.9
x = 0.9
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