Example

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

Question

$$\{ \begin{array} { l } { x ^ { 2 } - y ^ { 2 } + 2 x - 4 = 0 } \\ { x + y = 0 } \end{array}$$

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