2(k-1)=28

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Solution for 2(k-1)=28 equation: 



2(k-1)=28

We move all terms to the left:

2(k-1)-(28)=0

We multiply parentheses

2k-2-28=0

We add all the numbers together, and all the variables

2k-30=0

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

2k=30

k=30/2

k=15

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