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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
8/(3*x) = 7/16 // - 7/16
8/(3*x)-(7/16) = 0
8/(3*x)-7/16 = 0
8/3*x^-1 = 7/16 // : 8/3
x^-1 = 21/128
-1 < 0
1/(x^1) = 21/128 // * x^1
1 = 21/128*x^1 // : 21/128
128/21 = x^1
x = 128/21
x = 128/21
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