-120=-3(5+7n)

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Solution for -120=-3(5+7n) equation: 



-120=-3(5+7n)

We move all terms to the left:

-120-(-3(5+7n))=0

We add all the numbers together, and all the variables

-(-3(7n+5))-120=0



We calculate terms in parentheses: -(-3(7n+5)), so:

-3(7n+5)

We multiply parentheses

-21n-15

Back to the equation:

-(-21n-15)



We get rid of parentheses

21n+15-120=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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