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12-5k=5k+2
We move all terms to the left:
12-5k-(5k+2)=0
We get rid of parentheses
-5k-5k-2+12=0
We add all the numbers together, and all the variables
-10k+10=0
We move all terms containing k to the left, all other terms to the right
-10k=-10
k=-10/-10
k=1
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