12=3(1+n)

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Solution for 12=3(1+n) equation: 



12=3(1+n)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(3(n+1)), so:

3(n+1)

We multiply parentheses

3n+3

Back to the equation:

-(3n+3)



We get rid of parentheses

-3n-3+12=0

We add all the numbers together, and all the variables

-3n+9=0

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

-3n=-9

n=-9/-3

n=+3

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