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9=1-3k-4
We move all terms to the left:
9-(1-3k-4)=0
We add all the numbers together, and all the variables
-(-3k-3)+9=0
We get rid of parentheses
3k+3+9=0
We add all the numbers together, and all the variables
3k+12=0
We move all terms containing k to the left, all other terms to the right
3k=-12
k=-12/3
k=-4
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