Example

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

Question

$$2(a^{2}-b^{2})-3[a^{2}-\{b^{2}-a^{2}+(a^{2}-b^{2}-a^{2})\}]$$

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