5 second challenge

Algebra Level pending

\(A=\begin{bmatrix} 123 & x & 789 \end{bmatrix}\\ \\ B=\begin{bmatrix} 101 & 112 & 131 \\ 415 & 161 & 718 \\ 192 & 21 & 222 \end{bmatrix}\\ \\ C=\begin{bmatrix} 324 \\ 252 \\ 627 \end{bmatrix}\\ \\ If\quad ABC=[0],\quad find\quad \left\lfloor x \right\rfloor .\)

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