-31=k-13

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Solution for -31=k-13 equation: 



-31=k-13

We move all terms to the left:

-31-(k-13)=0

We get rid of parentheses

-k+13-31=0

We add all the numbers together, and all the variables

-1k-18=0

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

-k=18

k=18/-1

k=-18

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