Example

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

Question

$$663 ^ { \frac { 3 } { 3 } 4 a - 8 a b + 6 b + 15 a b + 18 a - 13 a b + 16 a - 5 }$$

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