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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/x-35 = 45 // - 45
60/x-45-35 = 0
60*x^-1 = 80 // : 60
x^-1 = 4/3
-1 < 0
1/(x^1) = 4/3 // * x^1
1 = 4/3*x^1 // : 4/3
3/4 = x^1
x = 3/4
x = 3/4
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