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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-120 = 60 // - 60
2/x-120-60 = 0
2*x^-1 = 180 // : 2
x^-1 = 90
-1 < 0
1/(x^1) = 90 // * x^1
1 = 90*x^1 // : 90
1/90 = x^1
x = 1/90
x = 1/90
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