z 7 a + z 7 a 3 + 5 z 6 a 2 + 2 z 6 a 4 + 3 z 6 + 4 a z 5 + 4 z 5 a + z 5 a 3 + z 5 a 5 + 3 a 2 z 4 − 11 z 4 a 2 − 6 z 4 a 4 − 2 z 4 + a 3 z 3 − 4 a z 3 − 9 z 3 a − 7 z 3 a 3 − 3 z 3 a 5 − 2 a 2 z 2 + 7 z 2 a 2 + 5 z 2 a 4 + a z + 3 z a + 4 z a 3 + 2 z a 5 − 2 a 2 − 1 a 4 {\displaystyle {\frac {z^{7}}{a}}+{\frac {z^{7}}{a^{3}}}+{\frac {5z^{6}}{a^{2}}}+{\frac {2z^{6}}{a^{4}}}+3z^{6}+4az^{5}+{\frac {4z^{5}}{a}}+{\frac {z^{5}}{a^{3}}}+{\frac {z^{5}}{a^{5}}}+3a^{2}z^{4}-{\frac {11z^{4}}{a^{2}}}-{\frac {6z^{4}}{a^{4}}}-2z^{4}+a^{3}z^{3}-4az^{3}-{\frac {9z^{3}}{a}}-{\frac {7z^{3}}{a^{3}}}-{\frac {3z^{3}}{a^{5}}}-2a^{2}z^{2}+{\frac {7z^{2}}{a^{2}}}+{\frac {5z^{2}}{a^{4}}}+az+{\frac {3z}{a}}+{\frac {4z}{a^{3}}}+{\frac {2z}{a^{5}}}-{\frac {2}{a^{2}}}-{\frac {1}{a^{4}}}}
