Example

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

Question

$$\quad ( a ^ { 2 } b ^ { 2 } + b ^ { 2 } c ^ { 2 } ) ( a b - b c )$$

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