/ ___\ / ___\
| 1 I*\/ 7 | | 1 I*\/ 7 |
1*(x - 1)*|x + - + -------|*|x + - - -------|
\ 2 2 / \ 2 2 /
((1*(x - 1))*(x + (1/2 + i*sqrt(7)/2)))*(x + (1/2 - i*sqrt(7)/2))
/ 2\ (-1 + x)*\2 + x + x /
(-1 + x)*(2 + x + x^2)