n+(n+1)+(n+2)=-3

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Solution for n+(n+1)+(n+2)=-3 equation: 



n+(n+1)+(n+2)=-3

We move all terms to the left:

n+(n+1)+(n+2)-(-3)=0

We add all the numbers together, and all the variables

n+(n+1)+(n+2)+3=0

We get rid of parentheses

n+n+n+1+2+3=0

We add all the numbers together, and all the variables

3n+6=0

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

3n=-6

n=-6/3

n=-2

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