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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 8/3 // - 8/3
7/x-(8/3) = 0
7/x-8/3 = 0
7*x^-1 = 8/3 // : 7
x^-1 = 8/21
-1 < 0
1/(x^1) = 8/21 // * x^1
1 = 8/21*x^1 // : 8/21
21/8 = x^1
x = 21/8
x = 21/8
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