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8=-k+28
We move all terms to the left:
8-(-k+28)=0
We add all the numbers together, and all the variables
-(-1k+28)+8=0
We get rid of parentheses
1k-28+8=0
We add all the numbers together, and all the variables
k-20=0
We move all terms containing k to the left, all other terms to the right
k=20
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