21-4n=7+3n

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Solution for 21-4n=7+3n equation: 



21-4n=7+3n

We move all terms to the left:

21-4n-(7+3n)=0

We add all the numbers together, and all the variables

-4n-(3n+7)+21=0

We get rid of parentheses

-4n-3n-7+21=0

We add all the numbers together, and all the variables

-7n+14=0

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

-7n=-14

n=-14/-7

n=+2

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