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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 24/32 // - 24/32
15/x-(24/32) = 0
15/x-3/4 = 0
15*x^-1 = 3/4 // : 15
x^-1 = 1/20
-1 < 0
1/(x^1) = 1/20 // * x^1
1 = 1/20*x^1 // : 1/20
20 = x^1
x = 20
x = 20
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