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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8-(5/x) = 3/4 // - 3/4
8-(5/x)-(3/4) = 0
8-5*x^-1-3/4 = 0
-5*x^-1 = -29/4 // : -5
x^-1 = 29/20
-1 < 0
1/(x^1) = 29/20 // * x^1
1 = 29/20*x^1 // : 29/20
20/29 = x^1
x = 20/29
x = 20/29
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