7n+2(1-n)-2(1+n)=21

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Solution for 7n+2(1-n)-2(1+n)=21 equation: 



7n+2(1-n)-2(1+n)=21

We move all terms to the left:

7n+2(1-n)-2(1+n)-(21)=0

We add all the numbers together, and all the variables

7n+2(-1n+1)-2(n+1)-21=0

We multiply parentheses

7n-2n-2n+2-2-21=0

We add all the numbers together, and all the variables

3n-21=0

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

3n=21

n=21/3

n=7

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