7+4=21-n

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Solution for 7+4=21-n equation: 



7+4=21-n

We move all terms to the left:

7+4-(21-n)=0

We add all the numbers together, and all the variables

-(-1n+21)+7+4=0

We add all the numbers together, and all the variables

-(-1n+21)+11=0

We get rid of parentheses

1n-21+11=0

We add all the numbers together, and all the variables

n-10=0

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

n=10

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