$$( { 9 }^{ 2 } - { 5 }^{ 2 } )+( { 7 }^{ 2 } -27)$$
$78$
$$81-5^{2}+7^{2}-27$$
$$81-25+7^{2}-27$$
$$56+7^{2}-27$$
$$56+49-27$$
$$105-27$$
$$78$$
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$2\times 3\times 13$
