Example

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

Question

$$f(\begin{matrix}x\\ y\\ z\end{matrix})=(\begin{matrix}2x+y\\ y-x\\ 2y+4z\end{matrix})$$

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