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-2(5k+3)=-86
We move all terms to the left:
-2(5k+3)-(-86)=0
We add all the numbers together, and all the variables
-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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