z 7 a + z 7 a 3 + 5 z 6 a 2 + 3 z 6 a 4 + 2 z 6 + a z 5 + z 5 a + 3 z 5 a 3 + 3 z 5 a 5 − 13 z 4 a 2 − 5 z 4 a 4 + 2 z 4 a 6 − 6 z 4 − 3 a z 3 − 8 z 3 a − 9 z 3 a 3 − 3 z 3 a 5 + z 3 a 7 + 12 z 2 a 2 + 6 z 2 a 4 − z 2 a 6 + 5 z 2 + 2 a z + 5 z a + 6 z a 3 + 2 z a 5 − z a 7 − 6 a 2 − 3 a 4 − 2 {\displaystyle {\frac {z^{7}}{a}}+{\frac {z^{7}}{a^{3}}}+{\frac {5z^{6}}{a^{2}}}+{\frac {3z^{6}}{a^{4}}}+2z^{6}+az^{5}+{\frac {z^{5}}{a}}+{\frac {3z^{5}}{a^{3}}}+{\frac {3z^{5}}{a^{5}}}-{\frac {13z^{4}}{a^{2}}}-{\frac {5z^{4}}{a^{4}}}+{\frac {2z^{4}}{a^{6}}}-6z^{4}-3az^{3}-{\frac {8z^{3}}{a}}-{\frac {9z^{3}}{a^{3}}}-{\frac {3z^{3}}{a^{5}}}+{\frac {z^{3}}{a^{7}}}+{\frac {12z^{2}}{a^{2}}}+{\frac {6z^{2}}{a^{4}}}-{\frac {z^{2}}{a^{6}}}+5z^{2}+2az+{\frac {5z}{a}}+{\frac {6z}{a^{3}}}+{\frac {2z}{a^{5}}}-{\frac {z}{a^{7}}}-{\frac {6}{a^{2}}}-{\frac {3}{a^{4}}}-2}
