Example

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

Question

$$(7 \sqrt{ 5 } -8 \sqrt{ 5 } )(9 \sqrt{ 7 } -4 \sqrt{ 7 }$$

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