a 5 z 7 + a 3 z 7 + a 6 z 6 + 2 a 4 z 6 + a 2 z 6 − 5 a 5 z 5 − 4 a 3 z 5 + a z 5 − 5 a 6 z 4 − 8 a 4 z 4 − 2 a 2 z 4 + z 4 + 7 a 5 z 3 + 5 a 3 z 3 − a z 3 + z 3 a + 6 a 6 z 2 + 7 a 4 z 2 + z 2 a 2 − 3 a 5 z − 3 a 3 z − a 6 − a 4 − 1 a 2 {\displaystyle a^{5}z^{7}+a^{3}z^{7}+a^{6}z^{6}+2a^{4}z^{6}+a^{2}z^{6}-5a^{5}z^{5}-4a^{3}z^{5}+az^{5}-5a^{6}z^{4}-8a^{4}z^{4}-2a^{2}z^{4}+z^{4}+7a^{5}z^{3}+5a^{3}z^{3}-az^{3}+{\frac {z^{3}}{a}}+6a^{6}z^{2}+7a^{4}z^{2}+{\frac {z^{2}}{a^{2}}}-3a^{5}z-3a^{3}z-a^{6}-a^{4}-{\frac {1}{a^{2}}}}
