3.5n+21=7n

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Solution for 3.5n+21=7n equation: 



3.5n+21=7n

We move all terms to the left:

3.5n+21-(7n)=0

We add all the numbers together, and all the variables

-3.5n+21=0

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

-3.5n=-21

n=-21/-3.5

n=+6

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