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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2700/x = 60 // - 60
2700/x-60 = 0
2700*x^-1 = 60 // : 2700
x^-1 = 1/45
-1 < 0
1/(x^1) = 1/45 // * x^1
1 = 1/45*x^1 // : 1/45
45 = x^1
x = 45
x = 45
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