Example

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

Question

$$-m-n+x(m+n)$$

Evaluate

$\left(x-1\right)\left(m+n\right)$

Expand

$mx+nx-m-n$

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