Example

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

Question

$$(\frac{1}{m^{2}-m}-\frac{1}{m-1})\cdot\frac{m}{m+2}+\frac{m+1}{m+2},$$

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