Example

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

Question

$$\left\{\begin{matrix} x+y=3 \\ { x }^{ 2 } - { y }^{ 2 } =-6 \end{matrix}\right.$$

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