-21=-7+k

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Solution for -21=-7+k equation: 



-21=-7+k

We move all terms to the left:

-21-(-7+k)=0

We add all the numbers together, and all the variables

-(k-7)-21=0

We get rid of parentheses

-k+7-21=0

We add all the numbers together, and all the variables

-1k-14=0

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

-k=14

k=14/-1

k=-14

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