Example

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

Question

$$\frac{1}{(x-y)(x-z)}+\frac{1}{(y-x)(y-z)}$$

Evaluate

$-\frac{1}{\left(x-z\right)\left(y-z\right)}$

Expand

$-\frac{1}{\left(x-z\right)\left(y-z\right)}$

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