Example

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

Question

$$\frac { ( 2 - 7 x ) ( 4 + 5 x ) } { ( 1 - 5 x ) ( 3 + 7 x ) } = 1$$

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