Example

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

Question

$$\frac { x ^ { 2 } - 49 } { x ^ { 2 } + 2 x } \times \frac { x + 2 } { x - 7 }$$

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