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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2 = 96/x // - 96/x
1.2-(96/x) = 0
1.2-96*x^-1 = 0
-96*x^-1 = -1.2 // : -96
x^-1 = 0.0125
-1 < 0
1/(x^1) = 0.0125 // * x^1
1 = 0.0125*x^1 // : 0.0125
80 = x^1
x = 80
x = 80
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