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