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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36-(4*(24/x)) = 24 // - 24
36-(4*(24/x))-24 = 0
36-96*x^-1-24 = 0
-96*x^-1 = -12 // : -96
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
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