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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-3n+12n-(7n-21)-9=0

We get rid of parentheses

-3n+12n-7n+21-9=0

We add all the numbers together, and all the variables

2n+12=0

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

2n=-12

n=-12/2

n=-6

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