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-7(-2k-2)=126
We move all terms to the left:
-7(-2k-2)-(126)=0
We multiply parentheses
14k+14-126=0
We add all the numbers together, and all the variables
14k-112=0
We move all terms containing k to the left, all other terms to the right
14k=112
k=112/14
k=8
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