Example

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

Question

$$\frac { x ^ { 2 } + 3 } { x ^ { 2 } - 9 } = \frac { x } { x + 3 }$$

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