Vieta's was fine, until this problem...

Algebra Level 4

The equation

x67x5+8x49x3+10x211x+12=0x^6-7x^5+8x^4-9x^3+10x^2-11x+12=0

has 6 (possibly complex) roots a1,a2,...,a6a_1, a_2, ..., a_6. Determine the value of

i=16(ai1)\left| \prod_{i=1}^{6} \left(a_i-1\right) \right|

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