It seems like there are some typos and missing symbols. Let's assume the system is as follows:
-21T_1 + 2T_2 + V_1 T_3 &= 17 \\
T_1 + T_2 + 13T_3 &= 214 \\
281 + 212T_1 - 17T_2 + 604T_3 &= r_3
Now, we can write this system in matrix form:
\begin{bmatrix}
-21 &
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