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9-5k=12-(6+7)
We move all terms to the left:
9-5k-(12-(6+7))=0
We add all the numbers together, and all the variables
-5k+9-(12-13)=0
We add all the numbers together, and all the variables
-5k+10=0
We move all terms containing k to the left, all other terms to the right
-5k=-10
k=-10/-5
k=+2
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