Example

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

Question

$$\frac { \sqrt { 2 + x } + \sqrt { 2 - x } } { \sqrt { 2 + x } - \sqrt { 2 - x } } = 2$$

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