21=-3(4n+5)+3(5n+8)

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Solution for 21=-3(4n+5)+3(5n+8) equation: 



21=-3(4n+5)+3(5n+8)

We move all terms to the left:

21-(-3(4n+5)+3(5n+8))=0



We calculate terms in parentheses: -(-3(4n+5)+3(5n+8)), so:

-3(4n+5)+3(5n+8)

We multiply parentheses

-12n+15n-15+24

We add all the numbers together, and all the variables

3n+9

Back to the equation:

-(3n+9)



We get rid of parentheses

-3n-9+21=0

We add all the numbers together, and all the variables

-3n+12=0

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

-3n=-12

n=-12/-3

n=+4

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