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7k=3k+20
We move all terms to the left:
7k-(3k+20)=0
We get rid of parentheses
7k-3k-20=0
We add all the numbers together, and all the variables
4k-20=0
We move all terms containing k to the left, all other terms to the right
4k=20
k=20/4
k=5
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