3n-15=7+n

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Solution for 3n-15=7+n equation: 



3n-15=7+n

We move all terms to the left:

3n-15-(7+n)=0

We add all the numbers together, and all the variables

3n-(n+7)-15=0

We get rid of parentheses

3n-n-7-15=0

We add all the numbers together, and all the variables

2n-22=0

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

2n=22

n=22/2

n=11

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