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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23/x = 5.75/5 // - 5.75/5
23/x-(5.75/5) = 0
23/x-1.15 = 0
23*x^-1 = 1.15 // : 23
x^-1 = 0.05
-1 < 0
1/(x^1) = 0.05 // * x^1
1 = 0.05*x^1 // : 0.05
20 = x^1
x = 20
x = 20
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