21-n=-87-2n

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Solution for 21-n=-87-2n equation: 



21-n=-87-2n

We move all terms to the left:

21-n-(-87-2n)=0

We add all the numbers together, and all the variables

-n-(-2n-87)+21=0

We add all the numbers together, and all the variables

-1n-(-2n-87)+21=0

We get rid of parentheses

-1n+2n+87+21=0

We add all the numbers together, and all the variables

n+108=0

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

n=-108

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