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z in (-oo:+oo)
((13*z^1)/7)*((6*z^6)/7-(2*z^14)) = 0
((13*z)/7)*((6*z^6)/7-2*z^14) = 0
13/7*z*(6/7*z^6-2*z^14) = 0
6/7*z^6-2*z^14 = 0
2*z^6*(3/7-z^8) = 0
-1*z^8 = -3/7 // : -1
z^8 = 3/7
z^8 = 3/7 // ^ 1/8
abs(z) = (3/7)^(1/8)
z = (3/7)^(1/8) or z = -(3/7)^(1/8)
2*z^6*(z-(3/7)^(1/8))*(z+(3/7)^(1/8)) = 0
13/7*2*z*z^6*(z-(3/7)^(1/8))*(z+(3/7)^(1/8)) = 0
( 13/7*z )
13/7*z = 0 // : 13/7
z = 0
( 2*z^6 )
2*z^6 = 0 // : 2
z^6 = 0
z = 0
( z+(3/7)^(1/8) )
z+(3/7)^(1/8) = 0 // - (3/7)^(1/8)
z = -(3/7)^(1/8)
( z-(3/7)^(1/8) )
z-(3/7)^(1/8) = 0 // + (3/7)^(1/8)
z = (3/7)^(1/8)
z in { 0, 0, -(3/7)^(1/8), (3/7)^(1/8) }
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