3(n-1)=2n+9

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Solution for 3(n-1)=2n+9 equation: 



3(n-1)=2n+9

We move all terms to the left:

3(n-1)-(2n+9)=0

We multiply parentheses

3n-(2n+9)-3=0

We get rid of parentheses

3n-2n-9-3=0

We add all the numbers together, and all the variables

n-12=0

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

n=12

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