Example

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

Question

$$= 15 ( 3 + 4 \sqrt { 5 } + 1 ) - 10 ( 9 + 4 \sqrt { 5 } + 4 \sqrt { 5 } ) + 9$$

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