-3+2n=21

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Solution for -3+2n=21 equation: 



-3+2n=21

We move all terms to the left:

-3+2n-(21)=0

We add all the numbers together, and all the variables

2n-24=0

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

2n=24

n=24/2

n=12

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