Example

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

Question

$$36 { \times }^{ 4 } -109 { \times }^{ 2 } { y }^{ 2 } +49 { y }^{ 4 }$$

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