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28=8k+12+-7k
We move all terms to the left:
28-(8k+12+-7k)=0
We add all the numbers together, and all the variables
-(+k)+28=0
We get rid of parentheses
-k+28=0
We add all the numbers together, and all the variables
-1k+28=0
We move all terms containing k to the left, all other terms to the right
-k=-28
k=-28/-1
k=+28
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