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D( x )
x/4 = 0
x/4 = 0
x/4 = 0
1/4*x = 0 // : 1/4
x = 0
x in (-oo:0) U (0:+oo)
9/(x/4) = 34 // - 34
9/(x/4)-34 = 0
36*x^-1 = 34 // : 36
x^-1 = 17/18
-1 < 0
1/(x^1) = 17/18 // * x^1
1 = 17/18*x^1 // : 17/18
18/17 = x^1
x = 18/17
x = 18/17
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