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4-k)/(-1-2)=-4
We move all terms to the left:
4-k)/(-1-2)-(-4)=0
We add all the numbers together, and all the variables
-k)/1-(-4)=0
We add all the numbers together, and all the variables
-k)/1-(=0
We multiply all the terms by the denominator
-k)=0
k=0/1
k=0
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