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18=8+2k
We move all terms to the left:
18-(8+2k)=0
We add all the numbers together, and all the variables
-(2k+8)+18=0
We get rid of parentheses
-2k-8+18=0
We add all the numbers together, and all the variables
-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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