7=18-k

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Solution for 7=18-k equation: 



7=18-k

We move all terms to the left:

7-(18-k)=0

We add all the numbers together, and all the variables

-(-1k+18)+7=0

We get rid of parentheses

1k-18+7=0

We add all the numbers together, and all the variables

k-11=0

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

k=11

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