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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x+2 = 5/7 // - 5/7
11/x-(5/7)+2 = 0
11/x-5/7+2 = 0
11*x^-1 = -9/7 // : 11
x^-1 = -9/77
-1 < 0
1/(x^1) = -9/77 // * x^1
1 = -9/77*x^1 // : -9/77
-77/9 = x^1
x = -77/9
x = -77/9
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