129=-3(1+7n)-n

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Solution for 129=-3(1+7n)-n equation: 



129=-3(1+7n)-n

We move all terms to the left:

129-(-3(1+7n)-n)=0

We add all the numbers together, and all the variables

-(-3(7n+1)-n)+129=0



We calculate terms in parentheses: -(-3(7n+1)-n), so:

-3(7n+1)-n

We add all the numbers together, and all the variables

-1n-3(7n+1)

We multiply parentheses

-1n-21n-3

We add all the numbers together, and all the variables

-22n-3

Back to the equation:

-(-22n-3)



We get rid of parentheses

22n+3+129=0

We add all the numbers together, and all the variables

22n+132=0

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

22n=-132

n=-132/22

n=-6

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