Example

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

Question

$$21 a ^ { 6 } b ^ { 7 } - 15 a ^ { 2 } b ^ { 8 } + 33 a b ^ { 2 } + 18 a ^ { 7 } b$$

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