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6(1+2k)+12=126
We move all terms to the left:
6(1+2k)+12-(126)=0
We add all the numbers together, and all the variables
6(2k+1)+12-126=0
We add all the numbers together, and all the variables
6(2k+1)-114=0
We multiply parentheses
12k+6-114=0
We add all the numbers together, and all the variables
12k-108=0
We move all terms containing k to the left, all other terms to the right
12k=108
k=108/12
k=9
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