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12-3k=20-7k
We move all terms to the left:
12-3k-(20-7k)=0
We add all the numbers together, and all the variables
-3k-(-7k+20)+12=0
We get rid of parentheses
-3k+7k-20+12=0
We add all the numbers together, and all the variables
4k-8=0
We move all terms containing k to the left, all other terms to the right
4k=8
k=8/4
k=2
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