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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/4 = 4/x-3 // - 4/x-3
6/4-(4/x)+3 = 0
6/4-4*x^-1+3 = 0
-4*x^-1 = -9/2 // : -4
x^-1 = 9/8
-1 < 0
1/(x^1) = 9/8 // * x^1
1 = 9/8*x^1 // : 9/8
8/9 = x^1
x = 8/9
x = 8/9
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