42+15=3n

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Solution for 42+15=3n equation: 



42+15=3n

We move all terms to the left:

42+15-(3n)=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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