Can you help me on the bottom part pls

asked Dec 2, 2023 72.8k views

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7 votes

$11x-21=8x+15\\3x-21=15\\3x=36\\x=\boxed{12}$

$LM=11(12)-21=\boxed{111}\\\\MN=LM=\boxed{111}\\\\LN=111+111=\boxed{222}$

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