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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+4 = 42/77 // - 42/77
6/x-(42/77)+4 = 0
6/x-6/11+4 = 0
6*x^-1 = -38/11 // : 6
x^-1 = -19/33
-1 < 0
1/(x^1) = -19/33 // * x^1
1 = -19/33*x^1 // : -19/33
-33/19 = x^1
x = -33/19
x = -33/19
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