Use the given set identities to write a $2-$coluTin proof for the new set identity $(A-B)\frac{}{b}ar(A)\frac{?}{b}=ar(AB).$ The format of your proof should be similar to the proof in Questions $19-28.$

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B $I$

$U_{?}$

A$)$

$8$

$+$

$...$

$x_x^{}$

$11.$

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