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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 48/60 // - 48/60
24/x-(48/60) = 0
24/x-4/5 = 0
24*x^-1 = 4/5 // : 24
x^-1 = 1/30
-1 < 0
1/(x^1) = 1/30 // * x^1
1 = 1/30*x^1 // : 1/30
30 = x^1
x = 30
x = 30
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