21+2n=-4(n+9)

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Solution for 21+2n=-4(n+9) equation: 



21+2n=-4(n+9)

We move all terms to the left:

21+2n-(-4(n+9))=0



We calculate terms in parentheses: -(-4(n+9)), so:

-4(n+9)

We multiply parentheses

-4n-36

Back to the equation:

-(-4n-36)



We get rid of parentheses

2n+4n+36+21=0

We add all the numbers together, and all the variables

6n+57=0

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

6n=-57

n=-57/6

n=-9+1/2

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