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D( a )
a^14 = 0
a^14 = 0
a^14 = 0
1*a^14 = 0 // : 1
a^14 = 0
a = 0
a in (-oo:0) U (0:+oo)
7/(a^14) = 14/6 // - 14/6
7/(a^14)-(14/6) = 0
7/(a^14)-7/3 = 0
7*a^-14 = 7/3 // : 7
a^-14 = 1/3
-14 < 0
1/(a^14) = 1/3 // * a^14
1 = 1/3*a^14 // : 1/3
3 = a^14
a^14 = 3 // ^ 1/14
abs(a) = 3^(1/14)
a = 3^(1/14) or a = -3^(1/14)
a in { 3^(1/14), -3^(1/14) }
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