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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/x+38 = 0
60*x^-1 = -38 // : 60
x^-1 = -19/30
-1 < 0
1/(x^1) = -19/30 // * x^1
1 = -19/30*x^1 // : -19/30
-30/19 = x^1
x = -30/19
x = -30/19
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