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