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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x = 0.5 // - 0.5
35/x-0.5 = 0
35*x^-1 = 0.5 // : 35
x^-1 = 0.01428571
-1 < 0
1/(x^1) = 0.01428571 // * x^1
1 = 0.01428571*x^1 // : 0.01428571
70.000021 = x^1
x = 70.000021
x = 70.000021
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