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k+2-7+2k=3+1
We move all terms to the left:
k+2-7+2k-(3+1)=0
We add all the numbers together, and all the variables
k+2k+2-7-4=0
We add all the numbers together, and all the variables
3k-9=0
We move all terms containing k to the left, all other terms to the right
3k=9
k=9/3
k=3
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