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10=-k+3k
We move all terms to the left:
10-(-k+3k)=0
We add all the numbers together, and all the variables
-(+2k)+10=0
We get rid of parentheses
-2k+10=0
We move all terms containing k to the left, all other terms to the right
-2k=-10
k=-10/-2
k=+5
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