-21=-15+k

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Solution for -21=-15+k equation: 



-21=-15+k

We move all terms to the left:

-21-(-15+k)=0

We add all the numbers together, and all the variables

-(k-15)-21=0

We get rid of parentheses

-k+15-21=0

We add all the numbers together, and all the variables

-1k-6=0

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

-k=6

k=6/-1

k=-6

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