-72=3(-5n-5)+3(-n-7)

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Solution for -72=3(-5n-5)+3(-n-7) equation: 



-72=3(-5n-5)+3(-n-7)

We move all terms to the left:

-72-(3(-5n-5)+3(-n-7))=0

We add all the numbers together, and all the variables

-(3(-5n-5)+3(-1n-7))-72=0



We calculate terms in parentheses: -(3(-5n-5)+3(-1n-7)), so:

3(-5n-5)+3(-1n-7)

We multiply parentheses

-15n-3n-15-21

We add all the numbers together, and all the variables

-18n-36

Back to the equation:

-(-18n-36)



We get rid of parentheses

18n+36-72=0

We add all the numbers together, and all the variables

18n-36=0

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

18n=36

n=36/18

n=2

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