(n-4)*3=42

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Solution for (n-4)*3=42 equation: 



(n-4)*3=42

We move all terms to the left:

(n-4)*3-(42)=0

We multiply parentheses

3n-12-42=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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