3(n-1)=12.

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Solution for 3(n-1)=12. equation: 



3(n-1)=12.

We move all terms to the left:

3(n-1)-(12.)=0

We add all the numbers together, and all the variables

3(n-1)-12=0

We multiply parentheses

3n-3-12=0

We add all the numbers together, and all the variables

3n-15=0

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

3n=15

n=15/3

n=5

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