2(n-2)+5(n-1)=12

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Solution for 2(n-2)+5(n-1)=12 equation: 



2(n-2)+5(n-1)=12

We move all terms to the left:

2(n-2)+5(n-1)-(12)=0

We multiply parentheses

2n+5n-4-5-12=0

We add all the numbers together, and all the variables

7n-21=0

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

7n=21

n=21/7

n=3

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