3n-9=12(n-3)

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Solution for 3n-9=12(n-3) equation: 



3n-9=12(n-3)

We move all terms to the left:

3n-9-(12(n-3))=0



We calculate terms in parentheses: -(12(n-3)), so:

12(n-3)

We multiply parentheses

12n-36

Back to the equation:

-(12n-36)



We get rid of parentheses

3n-12n+36-9=0

We add all the numbers together, and all the variables

-9n+27=0

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

-9n=-27

n=-27/-9

n=+3

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