7(3-n)=21-7n

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Solution for 7(3-n)=21-7n equation: 



7(3-n)=21-7n

We move all terms to the left:

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

We add all the numbers together, and all the variables

7(-1n+3)-(-7n+21)=0

We multiply parentheses

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

=0

n=0/1

n=0

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