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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
46/x = 2.3/5 // - 2.3/5
46/x-(2.3/5) = 0
46/x-0.46 = 0
46*x^-1 = 0.46 // : 46
x^-1 = 0.01
-1 < 0
1/(x^1) = 0.01 // * x^1
1 = 0.01*x^1 // : 0.01
100 = x^1
x = 100
x = 100
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