6-9n=21

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Solution for 6-9n=21 equation: 



6-9n=21

We move all terms to the left:

6-9n-(21)=0

We add all the numbers together, and all the variables

-9n-15=0

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

-9n=15

n=15/-9

n=-1+2/3

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