3 + k = 21k? plus the work

Mauget asked Jan 3, 2023

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Mauget asked Jan 3, 2023

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22 votes

$\begin{gathered} 3+k=21 \\ \text{subtract 3 from both sides} \\ 3-3+k=21-3 \\ k=18 \end{gathered}$

Lutz answered Jan 8, 2023

by Lutz

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