Example

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

Question

$$( - 9 + 6 n ^ { 7 } - 7 n ^ { 6 } ) + ( 2 n ^ { 7 } - 9 n ^ { 6 } - 9 )$$

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