7-8k=-21

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Solution for 7-8k=-21 equation: 



7-8k=-21

We move all terms to the left:

7-8k-(-21)=0

We add all the numbers together, and all the variables

-8k+28=0

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

-8k=-28

k=-28/-8

k=3+1/2

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