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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-7 = 9 // - 9
2/x-9-7 = 0
2*x^-1 = 16 // : 2
x^-1 = 8
-1 < 0
1/(x^1) = 8 // * x^1
1 = 8*x^1 // : 8
1/8 = x^1
x = 1/8
x = 1/8
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