3-7n-2n=21

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Solution for 3-7n-2n=21 equation: 



3-7n-2n=21

We move all terms to the left:

3-7n-2n-(21)=0

We add all the numbers together, and all the variables

-9n-18=0

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

-9n=18

n=18/-9

n=-2

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