31=9-2k

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Solution for 31=9-2k equation: 



31=9-2k

We move all terms to the left:

31-(9-2k)=0

We add all the numbers together, and all the variables

-(-2k+9)+31=0

We get rid of parentheses

2k-9+31=0

We add all the numbers together, and all the variables

2k+22=0

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

2k=-22

k=-22/2

k=-11

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