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3k=28-4k
We move all terms to the left:
3k-(28-4k)=0
We add all the numbers together, and all the variables
3k-(-4k+28)=0
We get rid of parentheses
3k+4k-28=0
We add all the numbers together, and all the variables
7k-28=0
We move all terms containing k to the left, all other terms to the right
7k=28
k=28/7
k=4
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