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12-(k+7)=2
We move all terms to the left:
12-(k+7)-(2)=0
We add all the numbers together, and all the variables
-(k+7)+10=0
We get rid of parentheses
-k-7+10=0
We add all the numbers together, and all the variables
-1k+3=0
We move all terms containing k to the left, all other terms to the right
-k=-3
k=-3/-1
k=+3
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