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-2=k+7^3
We move all terms to the left:
-2-(k+7^3)=0
We get rid of parentheses
-k-2-7^3=0
We add all the numbers together, and all the variables
-1k-345=0
We move all terms containing k to the left, all other terms to the right
-k=345
k=345/-1
k=-345
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