− 2 v u 3 + 3 u 3 + 5 v u 2 − 7 u 2 − 7 v u + 5 u + 3 v − 2 {\displaystyle -2vu^{3}+3u^{3}+5vu^{2}-7u^{2}-7vu+5u+3v-2}
