2(k-1)=8

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Solution for 2(k-1)=8 equation: 



2(k-1)=8

We move all terms to the left:

2(k-1)-(8)=0

We multiply parentheses

2k-2-8=0

We add all the numbers together, and all the variables

2k-10=0

We move all terms containing k to the left, all other terms to the right

2k=10

k=10/2

k=5

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