2(k-80)=30

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Solution for 2(k-80)=30 equation: 



2(k-80)=30

We move all terms to the left:

2(k-80)-(30)=0

We multiply parentheses

2k-160-30=0

We add all the numbers together, and all the variables

2k-190=0

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

2k=190

k=190/2

k=95

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