21-5n=7(3-n)+2n

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Solution for 21-5n=7(3-n)+2n equation: 



21-5n=7(3-n)+2n

We move all terms to the left:

21-5n-(7(3-n)+2n)=0

We add all the numbers together, and all the variables

-5n-(7(-1n+3)+2n)+21=0



We calculate terms in parentheses: -(7(-1n+3)+2n), so:

7(-1n+3)+2n

We add all the numbers together, and all the variables

2n+7(-1n+3)

We multiply parentheses

2n-7n+21

We add all the numbers together, and all the variables

-5n+21

Back to the equation:

-(-5n+21)



We get rid of parentheses

-5n+5n-21+21=0

We add all the numbers together, and all the variables

=0

n=0/1

n=0

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