3k-21=12

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Solution for 3k-21=12 equation: 



3k-21=12

We move all terms to the left:

3k-21-(12)=0

We add all the numbers together, and all the variables

3k-33=0

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

3k=33

k=33/3

k=11

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