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4=-4+k
We move all terms to the left:
4-(-4+k)=0
We add all the numbers together, and all the variables
-(k-4)+4=0
We get rid of parentheses
-k+4+4=0
We add all the numbers together, and all the variables
-1k+8=0
We move all terms containing k to the left, all other terms to the right
-k=-8
k=-8/-1
k=+8
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