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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 11/20 // - 11/20
7/x-(11/20) = 0
7/x-11/20 = 0
7*x^-1 = 11/20 // : 7
x^-1 = 11/140
-1 < 0
1/(x^1) = 11/140 // * x^1
1 = 11/140*x^1 // : 11/140
140/11 = x^1
x = 140/11
x = 140/11
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