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6k-(k-10)=20
We move all terms to the left:
6k-(k-10)-(20)=0
We get rid of parentheses
6k-k+10-20=0
We add all the numbers together, and all the variables
5k-10=0
We move all terms containing k to the left, all other terms to the right
5k=10
k=10/5
k=2
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