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4-(-2k)=10
We move all terms to the left:
4-(-2k)-(10)=0
We add all the numbers together, and all the variables
-(-2k)-6=0
We get rid of parentheses
2k-6=0
We move all terms containing k to the left, all other terms to the right
2k=6
k=6/2
k=3
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