6-3*n=21

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Solution for 6-3*n=21 equation: 



6-3n=21

We move all terms to the left:

6-3n-(21)=0

We add all the numbers together, and all the variables

-3n-15=0

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

-3n=15

n=15/-3

n=-5

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