Example

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

Question

$$\frac{ 121 }{ 9 { x }^{ 2 } } - \frac{ 4 }{ 25 { y }^{ 2 } }$$

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