Example

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

Question

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

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