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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5/x = 8/3 // - 8/3
2.5/x-(8/3) = 0
2.5/x-8/3 = 0
2.5*x^-1 = 8/3 // : 2.5
x^-1 = 1.06666667
-1 < 0
1/(x^1) = 1.06666667 // * x^1
1 = 1.06666667*x^1 // : 1.06666667
0.9375 = x^1
x = 0.9375
x = 0.9375
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