Simplify:
${(2 x - y)}^{2} - 18 (3 x - y) + 72$

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Solution

$(2 x - y)^{2} - 18 (3 x - y) + 72$
$4 x^{2} + y^{2} - 2 (2 x) y - 54 x + 18 y + 72$
$4 x^{2} + y^{2} - 4 x y - 54 x + 18 y + 72$

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