-100=7(1+3n)-2

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Solution for -100=7(1+3n)-2 equation: 



-100=7(1+3n)-2

We move all terms to the left:

-100-(7(1+3n)-2)=0

We add all the numbers together, and all the variables

-(7(3n+1)-2)-100=0



We calculate terms in parentheses: -(7(3n+1)-2), so:

7(3n+1)-2

We multiply parentheses

21n+7-2

We add all the numbers together, and all the variables

21n+5

Back to the equation:

-(21n+5)



We get rid of parentheses

-21n-5-100=0

We add all the numbers together, and all the variables

-21n-105=0

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

-21n=105

n=105/-21

n=-5

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