n-(n-1)-(n-2)=-7

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Solution for n-(n-1)-(n-2)=-7 equation: 



n-(n-1)-(n-2)=-7

We move all terms to the left:

n-(n-1)-(n-2)-(-7)=0

We add all the numbers together, and all the variables

n-(n-1)-(n-2)+7=0

We get rid of parentheses

n-n-n+1+2+7=0

We add all the numbers together, and all the variables

-1n+10=0

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

-n=-10

n=-10/-1

n=+10

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