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2(5k+3)=86
We move all terms to the left:
2(5k+3)-(86)=0
We multiply parentheses
10k+6-86=0
We add all the numbers together, and all the variables
10k-80=0
We move all terms containing k to the left, all other terms to the right
10k=80
k=80/10
k=8
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