3n+15=7n+n

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



3n+15=7n+n

We move all terms to the left:

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

We add all the numbers together, and all the variables

3n-(+8n)+15=0

We get rid of parentheses

3n-8n+15=0

We add all the numbers together, and all the variables

-5n+15=0

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

-5n=-15

n=-15/-5

n=+3

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