Example

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

Question

$$\frac{1}{(a-b)(c-a)}-\frac{1}{(a-c)(b-c)}$$

Evaluate

$-\frac{1}{\left(a-b\right)\left(b-c\right)}$

Expand

$-\frac{1}{\left(a-b\right)\left(b-c\right)}$

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