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