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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5/x = 9/36 // - 9/36
0.5/x-(9/36) = 0
0.5/x-1/4 = 0
0.5*x^-1 = 1/4 // : 0.5
x^-1 = 0.5
-1 < 0
1/(x^1) = 0.5 // * x^1
1 = 0.5*x^1 // : 0.5
2 = x^1
x = 2
x = 2
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