3(n+12)=21

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Solution for 3(n+12)=21 equation: 



3(n+12)=21

We move all terms to the left:

3(n+12)-(21)=0

We multiply parentheses

3n+36-21=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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