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3 + k = 21k? plus the work

3 + k = 21k? plus the work
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3 + k = 21k? plus the work

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

User Niru Mukund Shah
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