7 x - 1 ---------- 3 x + x + 1
(-1.0 + x^7)/(1.0 + x + x^3)
7 -1 + x -------------- / 2\ 1 + x*\1 + x /
2 4 2 -2 + 2*x 1 + x - x - x + ---------- 3 1 + x + x
/ 2 3 4 5 6\ (-1 + x)*\1 + x + x + x + x + x + x / ----------------------------------------- 3 1 + x + x