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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 200/1100 // - 200/1100
7/x-(200/1100) = 0
7/x-2/11 = 0
7*x^-1 = 2/11 // : 7
x^-1 = 2/77
-1 < 0
1/(x^1) = 2/77 // * x^1
1 = 2/77*x^1 // : 2/77
77/2 = x^1
x = 77/2
x = 77/2
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