3(k+4)=21

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Solution for 3(k+4)=21 equation: 



3(k+4)=21

We move all terms to the left:

3(k+4)-(21)=0

We multiply parentheses

3k+12-21=0

We add all the numbers together, and all the variables

3k-9=0

We move all terms containing k to the left, all other terms to the right

3k=9

k=9/3

k=3

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