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10-k=-2k
We move all terms to the left:
10-k-(-2k)=0
We add all the numbers together, and all the variables
-1k-(-2k)+10=0
We get rid of parentheses
-1k+2k+10=0
We add all the numbers together, and all the variables
k+10=0
We move all terms containing k to the left, all other terms to the right
k=-10
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