5-2n=21

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Solution for 5-2n=21 equation: 



5-2n=21

We move all terms to the left:

5-2n-(21)=0

We add all the numbers together, and all the variables

-2n-16=0

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

-2n=16

n=16/-2

n=-8

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