2k+9=21+3k

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Solution for 2k+9=21+3k equation: 



2k+9=21+3k

We move all terms to the left:

2k+9-(21+3k)=0

We add all the numbers together, and all the variables

2k-(3k+21)+9=0

We get rid of parentheses

2k-3k-21+9=0

We add all the numbers together, and all the variables

-1k-12=0

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

-k=12

k=12/-1

k=-12

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