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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 28/44 // - 28/44
7/x-(28/44) = 0
7/x-7/11 = 0
7*x^-1 = 7/11 // : 7
x^-1 = 1/11
-1 < 0
1/(x^1) = 1/11 // * x^1
1 = 1/11*x^1 // : 1/11
11 = x^1
x = 11
x = 11
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