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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
49/x = 1.09 // - 1.09
49/x-1.09 = 0
49*x^-1 = 1.09 // : 49
x^-1 = 0.0222449
-1 < 0
1/(x^1) = 0.0222449 // * x^1
1 = 0.0222449*x^1 // : 0.0222449
44.95412432 = x^1
x = 44.95412432
x = 44.95412432
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