Example

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

Question

$$\frac{2}{(y+1)(y+2)}+\frac{1}{(y+1)^{2}(y+2)^{2}}-\frac{1}{(y+1)^{2}}$$

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