21=3+4+5n

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Solution for 21=3+4+5n equation: 



21=3+4+5n

We move all terms to the left:

21-(3+4+5n)=0

We add all the numbers together, and all the variables

-(5n+7)+21=0

We get rid of parentheses

-5n-7+21=0

We add all the numbers together, and all the variables

-5n+14=0

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

-5n=-14

n=-14/-5

n=2+4/5

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