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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/24 = 16/x // - 16/x
36/24-(16/x) = 0
36/24-16*x^-1 = 0
-16*x^-1 = -3/2 // : -16
x^-1 = 3/32
-1 < 0
1/(x^1) = 3/32 // * x^1
1 = 3/32*x^1 // : 3/32
32/3 = x^1
x = 32/3
x = 32/3
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