-90=-3(2+4n)

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Solution for -90=-3(2+4n) equation: 



-90=-3(2+4n)

We move all terms to the left:

-90-(-3(2+4n))=0

We add all the numbers together, and all the variables

-(-3(4n+2))-90=0



We calculate terms in parentheses: -(-3(4n+2)), so:

-3(4n+2)

We multiply parentheses

-12n-6

Back to the equation:

-(-12n-6)



We get rid of parentheses

12n+6-90=0

We add all the numbers together, and all the variables

12n-84=0

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

12n=84

n=84/12

n=7

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