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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-2 = 4/3 // - 4/3
7/x-(4/3)-2 = 0
7/x-4/3-2 = 0
7*x^-1 = 10/3 // : 7
x^-1 = 10/21
-1 < 0
1/(x^1) = 10/21 // * x^1
1 = 10/21*x^1 // : 10/21
21/10 = x^1
x = 21/10
x = 21/10
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