-90=-7n-2(1+2n)

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Solution for -90=-7n-2(1+2n) equation: 



-90=-7n-2(1+2n)

We move all terms to the left:

-90-(-7n-2(1+2n))=0

We add all the numbers together, and all the variables

-(-7n-2(2n+1))-90=0



We calculate terms in parentheses: -(-7n-2(2n+1)), so:

-7n-2(2n+1)

We multiply parentheses

-7n-4n-2

We add all the numbers together, and all the variables

-11n-2

Back to the equation:

-(-11n-2)



We get rid of parentheses

11n+2-90=0

We add all the numbers together, and all the variables

11n-88=0

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

11n=88

n=88/11

n=8

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