Easy
Add (−t3+5t2−6t)+(8t2−8t)(-t^{3}+5 t^{2}-6 t)+(8 t^{2}-8 t)(−t3+5t2−6t)+(8t2−8t)
−t3+13t2−14t -t^{3}+13 t^{2}-14 t−t3+13t2−14t
t3+12t2+14t t^{3}+12 t^{2}+14 tt3+12t2+14t
t2+35 t^{2}+35t2+35
t3+14t^{3}+14t3+14
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