Example

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

Question

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

Evaluate

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

Expand

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

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