Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$7 \left[ \begin{array} { l l l l } { 3 } & { - 5 } & { 9 } & { 4 } \end{array} \right]$$

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