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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/10 = 36/x // - 36/x
6/10-(36/x) = 0
6/10-36*x^-1 = 0
-36*x^-1 = -3/5 // : -36
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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