Example

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

Question

$$\begin{aligned}x^{2}-y^{2}&\\ \underline{x^{2}}&\\ \underline{x^{2}}&\\ 4}-&\end{aligned}$$

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