91=7(1+3n)

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Solution for 91=7(1+3n) equation: 



91=7(1+3n)

We move all terms to the left:

91-(7(1+3n))=0

We add all the numbers together, and all the variables

-(7(3n+1))+91=0



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

7(3n+1)

We multiply parentheses

21n+7

Back to the equation:

-(21n+7)



We get rid of parentheses

-21n-7+91=0

We add all the numbers together, and all the variables

-21n+84=0

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

-21n=-84

n=-84/-21

n=+4

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