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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-2 = 4/7 // - 4/7
3/x-(4/7)-2 = 0
3/x-4/7-2 = 0
3*x^-1 = 18/7 // : 3
x^-1 = 6/7
-1 < 0
1/(x^1) = 6/7 // * x^1
1 = 6/7*x^1 // : 6/7
7/6 = x^1
x = 7/6
x = 7/6
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