(-3+n)=18

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Solution for (-3+n)=18 equation: 



(-3+n)=18

We move all terms to the left:

(-3+n)-(18)=0

We add all the numbers together, and all the variables

(n-3)-18=0

We get rid of parentheses

n-3-18=0

We add all the numbers together, and all the variables

n-21=0

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

n=21

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