3=15-3n

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Solution for 3=15-3n equation: 



3=15-3n

We move all terms to the left:

3-(15-3n)=0

We add all the numbers together, and all the variables

-(-3n+15)+3=0

We get rid of parentheses

3n-15+3=0

We add all the numbers together, and all the variables

3n-12=0

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

3n=12

n=12/3

n=4

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