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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60-(8/x) = 100 // - 100
60-(8/x)-100 = 0
60-8*x^-1-100 = 0
-8*x^-1 = 40 // : -8
x^-1 = -5
-1 < 0
1/(x^1) = -5 // * x^1
1 = -5*x^1 // : -5
-1/5 = x^1
x = -1/5
x = -1/5
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