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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*(216/x) = 162 // - 162
6*(216/x)-162 = 0
1296*x^-1 = 162 // : 1296
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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