7+5n=2n+21(1+4n)

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Solution for 7+5n=2n+21(1+4n) equation: 



7+5n=2n+21(1+4n)

We move all terms to the left:

7+5n-(2n+21(1+4n))=0

We add all the numbers together, and all the variables

5n-(2n+21(4n+1))+7=0



We calculate terms in parentheses: -(2n+21(4n+1)), so:

2n+21(4n+1)

We multiply parentheses

2n+84n+21

We add all the numbers together, and all the variables

86n+21

Back to the equation:

-(86n+21)



We get rid of parentheses

5n-86n-21+7=0

We add all the numbers together, and all the variables

-81n-14=0

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

-81n=14

n=14/-81

n=-14/81

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