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10k-12=7k-3
We move all terms to the left:
10k-12-(7k-3)=0
We get rid of parentheses
10k-7k+3-12=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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