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18=4+2k
We move all terms to the left:
18-(4+2k)=0
We add all the numbers together, and all the variables
-(2k+4)+18=0
We get rid of parentheses
-2k-4+18=0
We add all the numbers together, and all the variables
-2k+14=0
We move all terms containing k to the left, all other terms to the right
-2k=-14
k=-14/-2
k=+7
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