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Can you help me on the bottom part pls

Can you help me on the bottom part pls-example-1

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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}

User Varun Chakervarti
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