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12+5k=6+7k
We move all terms to the left:
12+5k-(6+7k)=0
We add all the numbers together, and all the variables
5k-(7k+6)+12=0
We get rid of parentheses
5k-7k-6+12=0
We add all the numbers together, and all the variables
-2k+6=0
We move all terms containing k to the left, all other terms to the right
-2k=-6
k=-6/-2
k=+3
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