7k+2k=-1

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Solution for 7k+2k=-1 equation: 



7k+2k=-1

We move all terms to the left:

7k+2k-(-1)=0

We add all the numbers together, and all the variables

9k+1=0

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

9k=-1

k=-1/9

k=-1/9

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