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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 147 // - 147
7/x-147 = 0
7*x^-1 = 147 // : 7
x^-1 = 21
-1 < 0
1/(x^1) = 21 // * x^1
1 = 21*x^1 // : 21
1/21 = x^1
x = 1/21
x = 1/21
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