18=21-3n

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Solution for 18=21-3n equation: 



18=21-3n

We move all terms to the left:

18-(21-3n)=0

We add all the numbers together, and all the variables

-(-3n+21)+18=0

We get rid of parentheses

3n-21+18=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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