31=n-3(n-7)

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Solution for 31=n-3(n-7) equation: 



31=n-3(n-7)

We move all terms to the left:

31-(n-3(n-7))=0



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

n-3(n-7)

We multiply parentheses

n-3n+21

We add all the numbers together, and all the variables

-2n+21

Back to the equation:

-(-2n+21)



We get rid of parentheses

2n-21+31=0

We add all the numbers together, and all the variables

2n+10=0

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

2n=-10

n=-10/2

n=-5

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