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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x+1/2 = 5/4 // - 5/4
9/x+1/2-(5/4) = 0
9/x+1/2-5/4 = 0
9*x^-1 = 3/4 // : 9
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
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