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5k-7=3k+1
We move all terms to the left:
5k-7-(3k+1)=0
We get rid of parentheses
5k-3k-1-7=0
We add all the numbers together, and all the variables
2k-8=0
We move all terms containing k to the left, all other terms to the right
2k=8
k=8/2
k=4
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