15=-3(1+n)

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Solution for 15=-3(1+n) equation: 



15=-3(1+n)

We move all terms to the left:

15-(-3(1+n))=0

We add all the numbers together, and all the variables

-(-3(n+1))+15=0



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

-3(n+1)

We multiply parentheses

-3n-3

Back to the equation:

-(-3n-3)



We get rid of parentheses

3n+3+15=0

We add all the numbers together, and all the variables

3n+18=0

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

3n=-18

n=-18/3

n=-6

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