3n+21=16

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Solution for 3n+21=16 equation: 



3n+21=16

We move all terms to the left:

3n+21-(16)=0

We add all the numbers together, and all the variables

3n+5=0

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

3n=-5

n=-5/3

n=-1+2/3

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