3-3n=21

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Solution for 3-3n=21 equation: 



3-3n=21

We move all terms to the left:

3-3n-(21)=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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