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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
68/x = 17/20 // - 17/20
68/x-(17/20) = 0
68/x-17/20 = 0
68*x^-1 = 17/20 // : 68
x^-1 = 1/80
-1 < 0
1/(x^1) = 1/80 // * x^1
1 = 1/80*x^1 // : 1/80
80 = x^1
x = 80
x = 80
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