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