2n+9=12-n

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Solution for 2n+9=12-n equation: 



2n+9=12-n

We move all terms to the left:

2n+9-(12-n)=0

We add all the numbers together, and all the variables

2n-(-1n+12)+9=0

We get rid of parentheses

2n+1n-12+9=0

We add all the numbers together, and all the variables

3n-3=0

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

3n=3

n=3/3

n=1

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