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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((54/7)*x^3+6*x)*(x/(x^2)-81) = 0
(54/7*x^3+6*x)*(x^-1-81) = 0
54/7*x^3+6*x = 0
6*x*(9/7*x^2+1) = 0
9/7*x^2 = -1 // : 9/7
x^2 = -7/9
6*x = 0
6*x*(x^-1-81) = 0
( 6*x )
6*x = 0 // : 6
x = 0
( x^-1-81 )
1*x^-1 = 81 // : 1
x^-1 = 81
-1 < 0
1/(x^1) = 81 // * x^1
1 = 81*x^1 // : 81
1/81 = x^1
x = 1/81
x in { 0}
x = 1/81
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