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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 11/132 // - 11/132
5/x-(11/132) = 0
5/x-1/12 = 0
5*x^-1 = 1/12 // : 5
x^-1 = 1/60
-1 < 0
1/(x^1) = 1/60 // * x^1
1 = 1/60*x^1 // : 1/60
60 = x^1
x = 60
x = 60
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