Example

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

Question

$$(\frac{1}{a(a+1)}+\frac{1}{(a+1)(a+2)})\cdot\frac{a^{2}+2a}{8}:$$

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