Example

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

Question

$$(x+y-z)^{2}-(x-y+2)^{2}$$

Evaluate

$\left(2y-z-2\right)\left(2x-z+2\right)$

Expand

$4xy-2xz-4x-2yz+4y+z^{2}-4$

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