15=7-k

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Solution for 15=7-k equation: 



15=7-k

We move all terms to the left:

15-(7-k)=0

We add all the numbers together, and all the variables

-(-1k+7)+15=0

We get rid of parentheses

1k-7+15=0

We add all the numbers together, and all the variables

k+8=0

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

k=-8

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