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30=k+-23
We move all terms to the left:
30-(k+-23)=0
We add all the numbers together, and all the variables
-(k-23)+30=0
We get rid of parentheses
-k+23+30=0
We add all the numbers together, and all the variables
-1k+53=0
We move all terms containing k to the left, all other terms to the right
-k=-53
k=-53/-1
k=+53
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