3(n+12)=90

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Solution for 3(n+12)=90 equation: 



3(n+12)=90

We move all terms to the left:

3(n+12)-(90)=0

We multiply parentheses

3n+36-90=0

We add all the numbers together, and all the variables

3n-54=0

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

3n=54

n=54/3

n=18

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