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-4=-5+k
We move all terms to the left:
-4-(-5+k)=0
We add all the numbers together, and all the variables
-(k-5)-4=0
We get rid of parentheses
-k+5-4=0
We add all the numbers together, and all the variables
-1k+1=0
We move all terms containing k to the left, all other terms to the right
-k=-1
k=-1/-1
k=1
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