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Problem 20 Easy Difficulty

Perform the indicated operations.
$$(r+2 s-3 t)(2 r-2 s+t)$$


$\therefore(r+2 s-3 t)(2 r-2 s+t)=2 r^{2}+2 r s-5 r t-4 s^{2}+8 s t-3 t^{2}$


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