3+9n=21+6n

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Solution for 3+9n=21+6n equation: 



3+9n=21+6n

We move all terms to the left:

3+9n-(21+6n)=0

We add all the numbers together, and all the variables

9n-(6n+21)+3=0

We get rid of parentheses

9n-6n-21+3=0

We add all the numbers together, and all the variables

3n-18=0

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

3n=18

n=18/3

n=6

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