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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
73/x = 4/100 // - 4/100
73/x-(4/100) = 0
73/x-1/25 = 0
73*x^-1 = 1/25 // : 73
x^-1 = 1/1825
-1 < 0
1/(x^1) = 1/1825 // * x^1
1 = 1/1825*x^1 // : 1/1825
1825 = x^1
x = 1825
x = 1825
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