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7(2k+1)=105
We move all terms to the left:
7(2k+1)-(105)=0
We multiply parentheses
14k+7-105=0
We add all the numbers together, and all the variables
14k-98=0
We move all terms containing k to the left, all other terms to the right
14k=98
k=98/14
k=7
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