15+3n=21

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Solution for 15+3n=21 equation: 



15+3n=21

We move all terms to the left:

15+3n-(21)=0

We add all the numbers together, and all the variables

3n-6=0

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

3n=6

n=6/3

n=2

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