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9-11=12-k
We move all terms to the left:
9-11-(12-k)=0
We add all the numbers together, and all the variables
-(-1k+12)+9-11=0
We add all the numbers together, and all the variables
-(-1k+12)-2=0
We get rid of parentheses
1k-12-2=0
We add all the numbers together, and all the variables
k-14=0
We move all terms containing k to the left, all other terms to the right
k=14
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