Example

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

Question

$$a^{2}-b^{2}; \frac{2}{a+b}-\frac{2}{a-b}+\frac{4a}{a^{2}-b^{2}}$$

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