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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-2 = 11/x+1 // - 11/x+1
7/x-(11/x)-2-1 = 0
7/x-11*x^-1-2-1 = 0
-4*x^-1 = 3 // : -4
x^-1 = -3/4
-1 < 0
1/(x^1) = -3/4 // * x^1
1 = -3/4*x^1 // : -3/4
-4/3 = x^1
x = -4/3
x = -4/3
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