-15=6-3k

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Solution for -15=6-3k equation: 



-15=6-3k

We move all terms to the left:

-15-(6-3k)=0

We add all the numbers together, and all the variables

-(-3k+6)-15=0

We get rid of parentheses

3k-6-15=0

We add all the numbers together, and all the variables

3k-21=0

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

3k=21

k=21/3

k=7

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