21-3n=7n+3(5-4n)

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Solution for 21-3n=7n+3(5-4n) equation: 



21-3n=7n+3(5-4n)

We move all terms to the left:

21-3n-(7n+3(5-4n))=0

We add all the numbers together, and all the variables

-3n-(7n+3(-4n+5))+21=0



We calculate terms in parentheses: -(7n+3(-4n+5)), so:

7n+3(-4n+5)

We multiply parentheses

7n-12n+15

We add all the numbers together, and all the variables

-5n+15

Back to the equation:

-(-5n+15)



We get rid of parentheses

-3n+5n-15+21=0

We add all the numbers together, and all the variables

2n+6=0

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

2n=-6

n=-6/2

n=-3

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