2(n-1)=4

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Solution for 2(n-1)=4 equation: 



2(n-1)=4

We move all terms to the left:

2(n-1)-(4)=0

We multiply parentheses

2n-2-4=0

We add all the numbers together, and all the variables

2n-6=0

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

2n=6

n=6/2

n=3

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