6-3k=21+k

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Solution for 6-3k=21+k equation: 



6-3k=21+k

We move all terms to the left:

6-3k-(21+k)=0

We add all the numbers together, and all the variables

-3k-(k+21)+6=0

We get rid of parentheses

-3k-k-21+6=0

We add all the numbers together, and all the variables

-4k-15=0

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

-4k=15

k=15/-4

k=-3+3/4

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