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12-5k=2k-4
We move all terms to the left:
12-5k-(2k-4)=0
We get rid of parentheses
-5k-2k+4+12=0
We add all the numbers together, and all the variables
-7k+16=0
We move all terms containing k to the left, all other terms to the right
-7k=-16
k=-16/-7
k=2+2/7
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