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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
160/10 = 48/x // - 48/x
160/10-(48/x) = 0
160/10-48*x^-1 = 0
-48*x^-1 = -16 // : -48
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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