3n-15=42

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Solution for 3n-15=42 equation: 



3n-15=42

We move all terms to the left:

3n-15-(42)=0

We add all the numbers together, and all the variables

3n-57=0

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

3n=57

n=57/3

n=19

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