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D( x )
x^22 = 0
x^22 = 0
x^22 = 0
1*x^22 = 0 // : 1
x^22 = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(1/(x^22)) = 0.84 // - 0.84
1-(1/(x^22))-0.84 = 0
1-x^-22-0.84 = 0
-1*x^-22 = -0.16 // : -1
x^-22 = 0.16
-22 < 0
1/(x^22) = 0.16 // * x^22
1 = 0.16*x^22 // : 0.16
6.25 = x^22
x^22 = 6.25 // ^ 1/22
abs(x) = 6.25^(1/22)
x = 6.25^(1/22) or x = -6.25^(1/22)
x in { 6.25^(1/22), -6.25^(1/22) }
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