Example

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

Question

$$\frac{ 1 }{ (x-3)(x-4) } + \frac{ 1 }{ (x-4)(x-5) } + \frac{ 1 }{ (x-5)(x-3) }$$

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