Example

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

Question

$$\frac{ 1 }{ 5x } + \frac{ 1 }{ 6y } =12, \frac{ 1 }{ 3x } - \frac{ 3 }{ 7y } =8$$

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