Example

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

Question

$$a^{2}-(a-b)x-b^{2}$$

Evaluate

$\left(a-b\right)\left(b+a-x\right)$

Expand

$bx-ax+a^{2}-b^{2}$

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