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D( X )
1.08*X^16 = 0
1.08*X^16 = 0
1.08*X^16 = 0
1.08*X^16 = 0 // : 1.08
X^16 = 0
X = 0
X in (-oo:0) U (0:+oo)
2000 = X/(1.08*X^16) // - X/(1.08*X^16)
2000-(X/(1.08*X^16)) = 0
2000-0.92592593*X^-15 = 0
-0.92592593*X^-15 = -2000 // : -0.92592593
X^-15 = 2159.9999905
-15 < 0
1/(X^15) = 2159.9999905 // * X^15
1 = 2159.9999905*X^15 // : 2159.9999905
0.00046296 = X^15
X^15 = 0.00046296 // ^ 1/15
X = 0.00046296^(1/15)
X = 0.00046296^(1/15)
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